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Session 1- Python Programming for Selenium — Transcript

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0:03so from today onwards we are going to start learning python programming because
0:08the python programming is the most important thing before learning automation because if
0:13you work with any automation tool right the automation tool can understand the language
0:18so if you know the programming language well so you will be able to write the
0:22good number of test cases and uh effectively okay so from today onwards we are going to
0:27start a python programming language so first let us start with some basic concepts like what is
0:33python programming and where it is started what is the history and what are the different thing
0:38python programming will approach python language will support and also we'll compare python program
0:44python language with other programming languages which are already available in the market
0:48okay then we will understand why python is become more popular in the current day market and we will
0:55see some basic important things and after that i'll show you how we can install python and then
1:01we will see how to write a basic programs by using python programming language okay so first let us
1:07start with what is basically python what is python so let me just put a few important points here so
1:15python is basically in high level general purpose programming language the first point python is
1:23high level general purpose programming language so which which contains a multiple words here we need
1:29to understand individually so high level is one thing and general purpose and programming language
1:36so we need to divide the sentence then we need to understand clearly what exactly python means
1:41so python is a high level programming language what is high level means which is user friendly
1:48so everyone will able to understand the language if i write some code in the python everyone will
1:53easily understand it is more user friendly language and what is general purpose general
2:00purpose means by using python we can develop any kind of application it can be web application
2:06or mobile app application or desktop applications all kinds of applications we can develop by using
2:12python language so it's a general purpose so which is high level general purpose programming language
2:20now which is open source language open source means what it is freely available
2:24even java is not a free software so till java 8 free support is there after java
2:298 whatever versions you are going to install we need to buy some license
2:33if you are using java inside any companies but python is completely open source so we don't need
2:40to pay any money for that so we can just download and install i can start work with the python
2:46and the third point is platform independent most important feature so what is platform independent
2:52means we can install python and we can write a python program in one environment and we can run
2:57the same python program in another environment for example if you write your program on windows
3:02operating system and you can execute the same program on linux operating system or mac operating
3:08system everywhere so python is a platform independent and there are some programming
3:14languages which are completely platform dependent like c sharp but java is also platform independent
3:21so like java python is also platform independent okay so these are the three important points which
3:28we need to remember before starting python language so python is a high level general
3:32purpose programming language which is completely open source and it's a platform independent
3:39now let us compare the python with other languages why python is very easy to come
3:45easy when you compare with the python with other languages so why most of the people
3:50will feel easiness so when you work with the python language so let me just share a small
3:59picture then you will able to understand why python is exactly why python is more simpler than
4:07other programming languages because in the python we can simply write
4:11one single line statement in other programming languages we need to write
4:14multiple lines of code okay so let me just share a small screenshot hold on okay
4:25yeah now we can just look at this small picture and here i mentioned uh four programming languages
4:32okay one is python and c c plus plus and java and if you want to write a simple line
4:38or if you want to print something in python we have to just write only one single statement
4:43in the print we have to just specify whatever you want to print but if i just look at other
4:48programming languages and just look at the java here so the fourth one is a java point
4:53so if i just look at here if you want to print a small message at least we have to write three
4:58to four lines of code in java at least we have to write three to four lines of encode code in java
5:04and similar if you just go with c c and c plus plus also we have to write multiple lines of code
5:10so you can just look at with a simple example how python is very simple and very easy to learn
5:16but here if you want to start with java or c or c plus plus we need to again understand multiple
5:21keywords here what is in what is main what is printf what is written and if i start with java
5:26again we have to understand what is public class right public static void means all these things
5:31we need to understand but if you come to the python it is very simple language and with single
5:38statement we can just print some output so this example says how python is very easier than other
5:45languages okay if i write of 1000 lines of code in c java you can simply do the same thing within
5:5350 to 100 lines of code in python so because of easiness so that's the reason people are start
6:00learning python instead of going for java directly okay so python is very easy to learn and now
6:12python is a very easy language when you compare with the other languages now when i see the
6:18history of the python for example which language is coming to market first java or python so most
6:24people i think java is a old language than python right so actually the python is a very older
6:32language than java so python came into the market in 1980s only so 1980s the python came into market
6:41but in the 1990s java came into market but from the last 20 to 25 years java becomes very popular
6:50in the market than python but from the last five to 10 years python is becoming popular
6:56in the current market but why python is not that much become famous in the earlier years in the
7:021980s even in the 90s 1980s only the python is introduced after that java is came into market so
7:11there are multiple reasons are there so actually the python suppose in 1995 or in 1990s
7:19so we have only desktop applications we don't even have web applications at that time so whatever the
7:26market trending or market requirement at that time you have only java language is supporting
7:32more and java is more compatible at that time to develop those kind of applications and that
7:39is the reason java becomes very popular at that time in 1990s and 2000 from 2000 to 2010 2015.
7:47so during those years java becomes very famous in the market but after that what happens uh there
7:54are new trending technologies are coming into market like data science or big data or neural
7:58networks artificial intelligence especially these technologies java is not performing well more than
8:07the java so python is preferred because python is exactly a suitable language in those technologies
8:14so that is the reason the python trending is started now so python becoming very popular in the
8:20new trending technologies okay so using java just desktop applications or web applications or
8:27mobile applications you can develop but python by using python we can also develop
8:32web applications mobile applications as well as desktop applications but apart from that
8:39which is also more useful especially in the new terminal technologies like big data or artificial
8:46intelligence data science and so on okay so that is the reason python is becoming very popular in
8:52the nowadays so in future also maybe automation is also completely may move to the python programming
8:58because recently it is started python along with automation so initially automation is
9:04started with the java language because most of the web applications are developed using java
9:09so even selem is learning with java most of the people but recently people have started learning
9:14silly name with python language also because python is also supported in selenium okay so
9:20if i just come to the history part actually this is implemented python was started in around 1989.
9:28so here guru van rozam so he's a name of the other for that python programming language
9:35and at that time he's working on cwi company in the netherlands in 1991 so this guy published
9:42actual code so the initial version of python is 0.9.0 and after that they have added so many
9:48things in the middle versions like 1994 they have released python 1.0 and again which is introduced
9:56on new features like lambda expression map filter reduce all these things because developers this
10:01is very more useful for developers but they are newly added some futures at that time
10:06and after that 2.0 is also added uh new features like comprehensions garbage collection and so on
10:13and 2008 python 3 is got released and which is also called as a pi 3k and as soon as the python
10:213 got released from that time slowly python started become popular or famous in the market
10:28and actually python is a language which is written based on other two languages called abc
10:34and modular three so these are the two languages which were there at that time in 1980s so initial
10:40languages when computers are introduced in the market at that time we have only machine
10:44languages are there so these are the two languages are there at that time so based on them based on
10:50those languages python is started introduced so this is a basic history so there are multiple
10:55versions are there in the middle but as soon as python 3 started and people have started using
11:01it in multiple trending technologies and which is more compatible with the latest technologies
11:07all right so this is a simple understanding or basic understanding what is python and where
11:12it is started so if anyone if anyone asks you which one is a older language python or java
11:18so always python is older than java okay so python is a older language than java but java become
11:24very popular in the 1990s and 2000 years but now again python is becoming very famous in the market
11:31okay but when you compare these two languages python is very old language when you compare with
11:36the java okay so now let us see how to download and install python and i'll show you some basic
11:44programs how we can write a program and how we can compile it and how we can execute all these things
11:50and we have so many uh so much of flexibility in the python it's not like java so it's very simple
11:56and uh downloading software installing writing a program execution in everywhere you can just find
12:02easiness if you already know java programming you you definitely feel the easiness while learning
12:08the python okay now let us see how to download and install python on windows operating system it is
12:15almost same in the mac also so just only installer is different okay so how to download and install
12:22python so to download and install in python you can just go to the python official website you
12:27can just search for download python and which will open a python official website this is a download
12:35python python.org just go to this website now you can just go to the download section directly
12:43or the home page itself which will show you download the latest version of
12:46for windows and by default it is giving windows so and if you want to download mac you can just click
12:53on this link mac os and if you want to download windows you can just click on the windows link
12:58here and then it will navigate to windows python releases for windows and again 2 is also there
13:043 is also there so three is always latest and all the new implementations are available only
13:10python three okay so always download python three so when you just click on this link
13:16as soon as you click on this link which will start downloading the software
13:24okay i just click on that link just a moment
13:32okay so once you click on this link it will navigate to another page now you can just
13:36look at here i'm just clicking on the python 3 release python 3.9.6 so this is the latest version
13:44all right so if i just come down here there are multiple links also there again even in
13:49the windows also there are again 32-bit 64-bit is there right so now what we can do is we can
13:56just directly click on the windows installer 64-bit so now it is started downloading so i
14:03already have a download file just discarding this so once you download you will get installer file
14:11okay i'll show you what is that installer file here so here this is the installer file
14:18so you can just look at here python 3.9.6 amd64 dot exe this simple executable file you will get
14:26so once you get an exe file you can start installing the python so i will share a small
14:31document here you guys can try this on your mission so it just provided the download link
14:37here and once you downloaded your software or if you go if you are using mac so you can just
14:42go to this link and download the software okay so you will get an installer file like this so
14:48once you get an installer file you can just double click on it and then it will start installing the
14:53python it's very simple and straightforward and then it will open the installer screen like this
14:59and just select the first one install now and this is the actual default location where your
15:05python is going to install c uses admin app data local programs python python python39
15:12so this is a default location if you want to customize it if you want to install in some
15:15other location you can just customize installation then you have to browse the path okay so let it be
15:21the default location and here these are the two options are recommended install launcher for all
15:26users and add python 3.9 to path so select these two check boxes and then say click on the next
15:33so after that it will start installing your python it will take a few seconds of time and after that
15:40finally you will get this screen setup was successful so this is the only thing you have
15:45to do just three to four screens are there you have to just download the installer i provided
15:50the direct link here if i just open this link you will get this screen and you can just click on it
15:54you will download 3.9.6 is the latest version as of now okay so just go through these screens
16:02and you will able to install it is very simple and straightforward okay so this is the default
16:07installation location of your python so in the users admin app data local programs python and
16:14here you can see the python along with the version number this is a default installation location but
16:21once you install your python so how we will know whether python is successfully installed or not
16:27so once you've done the installation what you have to do is you just open the command prompt so on
16:33windows you can open the command prompt or if you are working on mac you can just open the terminal
16:38so once you open the command prompt like this just type python here so before installing the
16:45before installation if i just type python here it will show you the invalid command error but once
16:51you install your python and then open the command prompt and here just type python here then it will
16:57automatically show you the version number which python version you have successfully installed
17:03so you should get this version number that means you have successfully installed python simple okay
17:10so once you install your python you can write a python program anywhere you can just write in
17:15the notepad or command prompt or python itself is provided some kind of ides so we can also write a
17:22python program almost everywhere wherever you want to write your python program you can write it and
17:26you can compile it okay so it is very very simple so i'll show you how many ways we can
17:32write a program how many ways we can execute our python program so here let's go back and here i'll
17:39provide this document so you can just go to the document and install the python software and once
17:44you open the once you install the python software just open the command prompt and then give this uh
17:50command call just say python so that will give you version so if you are getting version means your
17:55python is successfully installed okay so guys are you able to do that it's very simple installation
18:02and just you need to download the software click on the next next next and it will finish it off
18:08i'll share the document after the session okay all right so once you download install
18:14on python on windows so the next thing is we can write a python program any place and we can run
18:20in many ways now i'll show you how many ways we can run the python code how many ways we can run
18:27the python code so i'll show you many ways but finally we will use one ide which is called pi
18:33champ pychamp is a the most popular ide where we will write all your python programs we can execute
18:39and everything even our automation skips also we are going to write in the pie chart so pycharm is
18:44the most popular editor which is available for python language even eclipse is also supported
18:49even eclipse also we can write a python program and we can execute but we have to additionally
18:54install pydev plugin within your eclipse if you want to work with eclipse we have to install
18:59pi dev plugin within the eclipse and we will do that but especially eclipse is only for java okay
19:05so most of the java developers will prefer to use eclipse but if you start working with the python
19:11better to go with the pycharm so which is the most popular editor which is available for python okay
19:17so before installing pi champ and everything i'll show you the general way of writing the program
19:22and execution of the pi program so the first thing is as soon as you install your python right
19:27python itself is providing some kind of editor called ideal if i just search go for idle so id
19:35le so by default the python will give you this client or we can say id integrated development
19:42environment so what is id means id means the editor so where we can write something suppose
19:48i'm using here notepad right if we want to write something i'm using a notepad so notepad is an ide
19:53similarly if you want to write your python program so we need to have some id
19:58and some ids will be by default we have python will give you and some ids we can externally
20:04download and install so by default uh python is giving one ide called idle id led and search for
20:14idle on your search bar of windows it will automatically pop up and just click on it so
20:21once you click on it which will open the window like this okay this is a ideal window and in this
20:29directly you can just write the python code so for example i want to print a simple message in
20:34python simple write one statement print you can just say in the double quotations hello world
20:42okay and then say bracket close and enter now we will get the output here this is output of the
20:48program simple line i have created suppose i say print 10 plus 20 enter now we'll get the 30 year
20:58so this is simple id which is provided by python itself but this is not going to use as a beginner
21:06you can just do some practice on this but actually in the projects we don't prefer to use it okay and
21:12these are all dynamic ids dynamic ideas in the sense as soon as you press enter the statement
21:18output will be printed here directly okay so this is idle so this is one of the editor which we have
21:26so which is also called as a python shell okay the other name is a python shell we can call it as a
21:32python shell so run a python code through idle so how we can open the idle we can simply search for
21:39idli and you don't need to install this separately by default you will get once you install python
21:47okay so in the python editor so this is a basically command prompt this is also
21:51command prompt so we need to execute everything here we don't see any ui here okay so run python
21:57code through idle this is also called as a python shell and the second way is we can also execute
22:04our python code through command prompt through command prompt also we can execute our python code
22:12but how we can do that let me just close this open the windows command prompter it's a cmd
22:19and which will open the windows command prompt so this is your windows command prompt
22:24so once you get the windows command prompt here you can directly write your program
22:29okay so here directly you can execute your program how to execute it so let me show you so
22:35for example here i can say uh i say python okay so as soon as you give a command python so now
22:45python command prompt is opened so you can see three greater than symbols so once you see the
22:52three gated symbols from here you can just start writing the python code python programming code
22:57okay so for example i say x equal to 10 and y equal to 20 now i want to print x
23:05plus y i say x plus y so then you will get 30 so now we have written three lines in the python
23:13code or if i just directly can say print 100 plus 200 i'm just showing a simple how we can write a
23:22program and i how we can execute through command prompt so this is a another way we can just write
23:28the python code and execute wherever you want just we need to go to the python command prompt
23:33how we will get the python command prompt here you can just say python and then automatically
23:38it will give you the python command prompt and from where you can start writing your python code
23:44okay but suppose in both the ways so here this is a command prompt
23:49and here i have a ideal so these two things work exactly the same way there is no much
23:54difference between these two so this is actual command prompt which is from default windows and
24:01this is additionally which is provided by python itself and both are working in the same way but
24:07here we cannot save this code as a single file okay suppose tomorrow i want to refer the program
24:15and it is just dynamically taking the data and it is dynamically giving the output
24:20but i want to save my program as a separate file and tomorrow i want to run my program
24:25right so that is not possible in these editors so for that what we can do is we have to go with
24:31some other way so we can also write a program in some file and we can execute that file as a python
24:39program so that means we can also run the python code we can also run the python code through
24:47notepad or notepad you can use any editor you can just write a python code and that particular file
24:53we can execute everywhere so now i'll show you how we can write a simple python code in the node
24:58pattern how we can execute let me just create a simple node pad file and i am giving tester dot
25:04and always in the python file should have p y is an extension not a txt
25:10okay remember that so whenever you create okay whenever you want to create a python file
25:17that extension of the file should be dot py dot py so now we can just open this file
25:25or anywhere you can just open in 8 plus plus or any anywhere you can use
25:29like even the notepad also i can just open so i'm just opening it edit plus plus
25:35and this is the editor i got or you can open this file in the notepad also no problem
25:40and here i'm writing the python code i say x equal to 100 y equal to 200 i just want to print the
25:45result of x plus y i say x plus y so three lines of code i have created and now saving the file
25:53and you can just close the file so now this file is representing one program in python program
26:00now i want to run my program through this file so how we can do that again go to the command prompt
26:08and here you can just say python right so here we need to specify it so what is the
26:16test dot py right so what is the location of the file you can just go to the properties
26:21and which will show you the location get this location and specify just paste it over here
26:30edit paste here if it's not able to paste just open the command prompt one more time
26:39copy the location whichever file you have created you have just copied slash the name
26:43of the file is tested dot py test dot py so along with this python keyword just specify the
26:51file which file you want to execute in that file we have written a small program
26:56now enter now as soon as you say enter it is giving the output of that program
27:03okay so this is how we can run the python program which is already created in some file
27:09so these are all different ways we can write our program and we can execute in multiple places
27:16so mainly these are the three things one is we can run the python code through idle which is
27:20a default id which is provided by python second thing is we can run the python code through cmd
27:27that means dynamically we can enter all the code in the command prompt itself
27:32and the third approach is we can write a python code or python program in a file
27:37it can be any file and uh then we have to save that file as a dot py extension
27:42and then we can execute that file from anywhere from your
27:45operating system from the command prompter so but you have to just give python is a command python
27:50specify the location of the file that's it which will give you output of that particular file so
27:56this is how normally we can run the python code or python programs in multiple ways
28:02but when you're working on real projects on day to day basis we don't prefer all these things
28:09okay so we need a kind of an editor or ide and like which is ui based and all the menu options
28:18should be there icon should be there and the result console window should be there so everyone
28:23should be everything should be there on the editor itself and it should be more flexible and
28:27sometimes it should able to give auto suggestions right so it makes our job very very easy
28:34so for that we need something different kind of editor so for that we have to go for pie charm
28:43pie jump is a most popular popular ide for python especially for pi for python
28:51okay so now let us see how we can download this id because while learning the python and also by
28:58learning the psyllium so throughout our sessions and extra sessions all the sessions we are going
29:02to use pie champ itself okay so now i'll show you how to download pie champ and how to install it
29:09and then we will see how to work with the pie chart how to write a single python code and
29:13how we can execute how we can see the output all these things so to download and install on python
29:19what you have to do is just go to the google and say download pie charm okay so once you
29:27search for download python for python or just say download python which will automatically
29:33give you some urls here so jet brains is actually company which is developing lot of products and
29:40pie jump is a one of the product among them so just go to this location and now you can
29:45see pycharm is also available for windows mac and linux and whichever operating system you
29:50are currently working just choose that particular tab here so currently we are working on windows so
29:56just go to the windows and again you can see two options here professional and community
30:02so professional is actually a free trial is available for few days but after that which
30:07will expire you have to pay something about it because it's not completely free but if
30:13you install professional we can just develop our html js sql and so many other support is there
30:19but we don't need all these things so just we can use community version this completely uh
30:26for pure python development okay which is completely free and open source we don't
30:31need to pay anything for that okay so but if you go with the professional version we will
30:37get some more advanced features uh in python again anyway we are not going to use all those features
30:43uh then we can go with the community version okay so let's go and click on the download
30:48here as soon as you click on the download which will start downloading the pycharm
30:53so i already downloaded it so we can just look at this this is a this is a icon you can see pie
31:00champ iphone com community pie champ underscore community so this is the id which we need
31:09okay so just pyjamp is not enough okay you have to download python also so first you need to install
31:16python completely and then download pie chart okay so now i already downloaded one piece of installer
31:27here so this is the installer so let's need to install this pycharm so to install this pie charm
31:33because when you download in a pie jump also by default pycharm will comes with some kind
31:39of virtual environment of python okay but if you want to really work with the python like
31:44development on automation everything so later on we have to install a lot of new packages so python
31:50should be there so whichever python software we have downloaded installed that should be there
31:56uh inside the pi champ so i'll show you how to configure our pycharm with our existing python
32:02which we already downloaded and installed okay so the next two step is we have downloaded this
32:08pycharm so i again have created a small document here you can just look at this
32:13so go to this website and you have to just download the software and here i provided
32:18screenshot also same thing which i have shown you and this is the installer file so once you
32:24get this installer file you can just double click it will start installing the python it's a very
32:28simple steps also it just it will give you one more screen like this and click on the next and
32:34uh this is a default location of pyjama and you can just have this location and click on the next
32:41and then and in this window you just select the first one python community edition
32:47and second one is add a bin folder to the path so just select this option because by default
32:54a python path should be added to the environment variable of your windows otherwise we have to do
32:59manually later so better to have check these two boxes python community edition and the second one
33:06update path variable and then click on the next so once you click on the next you will see one
33:10more screen like this and here you have to click on the install so once you click on the install
33:16then it will take some time and it will install and once you complete this process and finally
33:24you will see this window and it will ask you to reboot your mission okay so once you install this
33:30you have to reboot completely and then only the python works properly so you can just select the
33:36checkbox second checkbox i want to manually reboot later if you select this one you can later on you
33:41can just reboot but you can select the reboot now the first checkbox that will automatically reboot
33:47your mission after clicking on the finish that means your mission will be restarted
33:52that's it so this is how we need to just install the pycharm so these are just the basic steps i
33:57have captured the screenshots and this is again latest version of python screen so you don't need
34:03to worry at the time of installation because you will see the same screens okay all right so once
34:09you install your pi champ right so first time when you install your pycharm you will get a small icon
34:16on your desktop so you can i'll show you that so this is a simple icon you can see on your desktop
34:25or else you can just search in the search box you are not able to see the icon you can just search
34:30for here pie charm community edition so now let us open this and as soon as you open this [Music]
34:38and which will show you a beginning window like this as soon as you
34:46click on it so this is first uh first screen launching python so as soon as
34:53you click on that first screen will be like this and by default it is providing the dark
34:57dark theme and if you want to change the theme you can just change it i'll
35:02tell you how to change it i already changed it actually just a moment
35:09i'm just removing all these things
35:15okay so by default uh you will get this window and if you want to change the theme and you can
35:22just go to customize and here you can change the color theme okay i already changed it so and if
35:29you want to increase the pi charm font which will give you very smaller you cannot see that
35:33font most of the time so if you want to change or increase the ide font you can just increase
35:39number here okay and by default you will see four options first time when you launching your python
35:45and projects customize plugins and learn pie charts so you can just go to the project
35:51so in this window you can see three options new project which is creating a new project and open
35:57means which will open already existing project and get from vcsps any version control system like git
36:04or github is available from there also we can directly get the project so what is the project
36:08means we have to create a new project first because later on we will do all the stuff inside
36:14the project itself okay now let us create a new project so i'm just clicking on the new project
36:22so as soon as you created the new project so you can just browse the location where you want to
36:28create your project okay wherever you want to create project you can just browse the location
36:33you can just click on the browse here and you can show the location wherever you want to create a
36:38project and uh later on whatever the stuff we are going to do whatever programs and course scripts
36:44everything will be stored in that particular project so i have given some path here inside
36:49users admin python project and here i am saying uh some different name in the python projects i say
36:56python try name okay so this is a project name i have given python training and after that you
37:05can see some options here so basically what are these options is mainly this one okay so
37:12this is actually virtual environment which will automatically created and mainly base interpreter
37:17so what is this base interpreter means so at the time of python installation so by default this
37:23base interpreter will be something different so by default pi chomp also comes along with some python
37:29installer files but if you want to configure our own python with the python so we need to
37:35specify the base inter interpreter so what is this base interpreter is basically the location of the
37:41python which have installed earlier if i just go back i have already copied that location if i just
37:47look at here this is a location where actual python is installed so let me just open and if
37:53i just go individual folders you cannot see that because these are all hidden files okay so first
37:59let us go to the till app data i'll show you that so just go till app data now you can see local
38:07inside this local you can see programs so these are all hidden folders okay programs inside this
38:14python and inside this python three line so this is actual location of your python installation
38:20and you can see something called python.exe okay so if you want to configure our own python in the
38:26python so we need to specify this location as a base interpreter and this is a base interpreter
38:33so now go back to your pie chart and make sure and this path is correctly there or not
38:39so i already configured earlier so it is giving this one by default it will not show you so in
38:44that case you need to click on the browse and then you have to provide that path completely
38:49okay and then your base interpreter so whatever python you have already installed
38:53your pi champ is going to use that particular python okay so have this information and then
39:01only these are the only thing you have to check and then you have to provide your project name
39:06and this location is optional you but whenever wherever you want to create this location you
39:10can just create and browse it so once you have done this click on this and here it will ask
39:15you create a main dot py welcome script we don't need any default pi uh python program anything
39:21so we can just remove it create so once you have done this which is going to create a new python
39:28project so in the going forward whatever python programs we are going to create should be part
39:34of this project so this is just one time task all right so now okay it is saying some error so error
39:42configuring sdk so basically there is a conflict between the pi champ sdk software development kit
39:49which is by default coming comes along with the pie chart no problem so now we can just
39:55close that window and now we created a new project here python training okay so once you created this
40:02let us start creating a simple program in this so before that every day i will create a new folder
40:09inside this project okay so instead of writing all the programs in the project directly what i can do
40:16i'll create a new folders inside the project and inside the folder like day one day to day three
40:22and in every day whatever programs i am going to explain should be part of those folders
40:26now select the project and the new select the directory so here we can call it as a
40:32directory which is equal to folder now here we have to provide the name of the directory i say
40:38day one okay so day one and i just created a new folder so as soon as you created a
40:46new folder you can just create a simple python program for that we have to create a new file
40:52or you can directly select the python file you can just select the file or python file
40:57anything is anything is fine if you select only file you have to give the file name
41:03like my first program dot p y so dot p y you have to provide and you can just give any name
41:11to the program the extension of the file is dot p y should be given and then the new file
41:17is created and editor is also open here you can write a java python program here the other way is
41:24i can just delete this and other way of creating the file is like this i'll show you now close this
41:40you already deleted so okay just delete this
41:49okay it's not deleted yeah cancel
41:55so refresh somehow it is not deleted okay no problem so let it be there so let me just
42:00create a new file by using python file okay let me just create a python file
42:06so in this you want to give the extension just you have to provide the file name that's it i say my i
42:12say my file name is i say hello world okay hello world just enter then automatically which will
42:19create a new file called helloworld.py so here you need to provide an extension for that somehow
42:26the first file is got hanged i'm just closing okay so let's go to the second one hello dot py
42:33so this is how we can just create a new python file so whenever you want to write a simple
42:37program or first program you can just create a new python file so how the what is the extension
42:41of the python file dot py is a extension of the python file so as soon as you open the file
42:48somehow these files are not closing let me just close my python once again i'll open it once again
43:15just to give me a few seconds it is time to launch
43:30okay now it opens my project okay now i have closed my first file and first file already
43:37deleted so now it is updated so you can just close my editor also now this is a new file
43:42which you have created so like this you can create any number of python files inside the directory so
43:48let's just double click it will open the editor so here we can write our python program so by default
43:54it will give you a very smaller font here right uh i can say here i can simply say this is my first
44:05python program so you can see here this point is fine you're able to see here right but sometime
44:11by default it will give very small font so if you want to change the font or increase
44:16the font you can just go to the file and here you can see something called settings
44:22inside the settings just go to appearance behavior and under appearance you can just say
44:30editor not appearance go to editor inside the editor you can see font okay so here you
44:36can increase the font if you want to see l big characters okay and say okay automatically the
44:41font will be increased so now this is the first program i'm just going to create so here i'm
44:47just writing simple call simple print statement print so whenever you want to print something
44:53you have to use print method or print the command print in the bracket we have to keep
44:57whatever you want to print i say so hello world and uh this is my first python program and like
45:09java here we don't have any semicolons end of the statement nothing here just a plain statement it's
45:15very similar to english language you get everyone easily understand the statements okay so here we
45:20don't have any semicolon even though if you keep the semicolon nothing happens here no problem at
45:25all okay so but have written simple statement here but how to execute this statement so to execute
45:31statement just right click here and then say run hello world or you can directly if you want to
45:36run you can just use run button will be enabled here and that you have to click let me save the
45:42file okay let me just run as a hello world okay so it is giving some error related to interpreter
45:50so you can see python interpreter is not properly configured so we have to configure that
45:55so let me select this then say apply and say overturn so next time it won't ask you anything so
46:03now we can see the program is output is displayed so this is a a terminal we can say console window
46:09and which will automatically displayed here as soon as you executed your program
46:14and suppose i'll take a x equal to 100 and y equal to 200 i want to perform some of these two numbers
46:21and print the output in the console window simply we can say print 100 plus or you can say x plus y
46:30and then execute so now we can see this is the output of the first statement
46:35and this is the output of the print statement okay so in this editor we can write a simply
46:42python program and which will give you the result in this console window
46:48so now you can see how the green button is enabled you can just use this to execute your
46:52program okay so this pie jump we will discuss a few more options in the python slowly one by one
46:58but this is a way we need to first create a new project inside the pi champ then you can create
47:05any number of files inside this project so every day i will create a new folder or new directory
47:10like this day 1 day 2 day 3 and so on and i will keep all the programs inside this files and later
47:18now i am just closing my file so later on i want execute the same program then again go again open
47:24the file because the file is always will be in this folder itself which will not be deleted so
47:30again you can execute this program so you can run any number of times once you write your program
47:36okay so this is how first we need to open the pie charm and then create a new project
47:45and just create a new file python file always the file name should be dot p y and you can just
47:50simply write a program and execute okay so now we will discuss a few important programming concepts
47:57so till now we have just seen how to install and how to do setup everything so i can just share
48:04this document and even pie champ installation also have given in this document you can just go
48:09through this and you can install yourself okay it's very simple and straightforward are you
48:16guys able to do that please confirm in the chat window can you do this by seeing this document
48:23same steps you have to perform okay nothing new because this is the latest version by champ i
48:28have tried and latest version of python so you don't see any new thing other than this document
48:35okay so it is always suggest windows operating system to practice everything
48:42okay because in the real-time environment you don't use linux operating system to write
48:46automation code so linux is basically used for the servers if you want to install any database
48:51servers or any web servers the linux mission will be used even mac also will not be used most of the
48:57times okay fine so i'll share this document and you guys can try to install python first
49:04and install pycharm and get ready environment okay now i'll show you a few important things related
49:11to the python programming language so if you want to start learning any programming language right
49:16suppose if you start learning an english language how we will start learning so first we will start
49:20like alphabets and then we will start how to write the words and then sentences and then
49:24paragraphs and so on right similarly if you want to learn any programming language the same order
49:30we have to follow the first we need to learn some basic things like comments or data type operators
49:36right and after that slowly we will learn control statement looping statement and there
49:40are many concepts we have in the programming so now let me show you something called comments
49:46what are the comments in program so basically comments are used to write some description
49:55about the application like a logic so suppose what is the program the program contains a number of
50:00statements to today you have created some program like this right so we have written some statements
50:05like this and tomorrow somebody is trying to read your code and how they will know what exactly how
50:12written in this your statement what kind of logic you have written so whatever you have written
50:17in your program can just write some description because the code will be more readable to others
50:23so others will feel very easy to understand your code by reading your code okay so for that we
50:29need to write some kind of description which is basically called as a comments
50:33so what is the main importance of comments so basically the comments are used to write a
50:40small description about your application logics to understand the logics very easily somebody
50:45somebody else can easily understand your code and basically the main purpose of writing comments is
50:51improving the readability that's the main objective of writing the comments
50:55so the main object of comments that code maintenance will become very very easy and
51:00the comments are non-executable code what is the comment comment means non-executable code means
51:06python will not execute the comment so for example i have written this statement let me create one
51:12more program i am just closing this so let us create a new file and i'll name it as a comments
51:21dot py this is another python file okay suppose i want to write some description here or like
51:27say other name and designation and everything we created this program and everything i will
51:31put some comment for example name of the programmer let's say name of the programmer
51:37okay and then designation and then which offer of which application is writing all these things
51:43okay so like this if you want to write some description you can just put them in the
51:47comment section like say hash so hash used as a commenter so whenever we say
51:53hash these statements are become comments so python will not execute the statement at runtime
52:00so python will just ignore the statement because these are just a comments so like this whatever
52:06code you have written in your program you can just write comment for all the statements
52:11and that will increase the readability of the code okay so python will just ignore the comments
52:18just ignore the comments suppose sometimes you may have only one line comment and sometimes
52:23you may have multiple lines comments but how we can represent them so for example in this i'm
52:28just writing a simple statement i say print okay so here uh i'll put some statement i'm working
52:37with i'm working with python so i've just written some statement here so i'm just executing this
52:45and then you will get the output so every time it is asking here instead of configuring this python
52:50interpreter so just configure that the project level go to the project go to the file settings
53:02okay so here this is a project for python interpreter so here we don't
53:07have interpreter associated so here select the interpreter if you do configuration here
53:12every time it will not ask you okay so every file it is asking to specify the python interface so
53:19once you've done the setting here it will not ask you again and say apply end up okay
53:26okay now i have just written a simple statement here now when i execute this
53:32let me execute the code so once you configure interpreter it is getting some files internally
53:39okay let me just execute so now we got some output so i want to write some description
53:45about the statement suppose if you want to write a single and comment hash is a symbol
53:51hash and you can simply write a simple message let's say this is a python program
53:58like this you can just a single write a single line comment
54:01suppose if you want to write a multiple lines comment then how we can do that so i want have
54:06written three four five lines of code i want to comment all these lines so i want to comment
54:11all these lines so simply what you can do is you can in python we can use three double quotations
54:18beginning and here also three double quotation at the end now all these statements are considered as
54:24a comments this is the one way you can do that the other way is you can just have multiple statements
54:32and you can also use single quotations three times and here also single quotations three times
54:39so this is also considered as a command this is also considered as a comment so this one
54:45and this one and also this one so anything is fine and single and comment you can use a hash
54:54but is there any shortcut keys available yes suppose i don't have a command for this
55:01and i want to comment this single statement we have a control select the statement i say
55:06control forward slash control forward slash so cd rl control plus forward slash then automatically
55:15that line will be commented now if you want to remove that comment then again control slash
55:21that comment will be removed so for adding comment and removing comment the same shortcut key can use
55:26control slash similarly suppose i want to comment multiple lines what is the shortcut key we have
55:36so if you want to comment multiple lines select all the statements whatever you
55:39want to commit i say control shift to slash so shifty is newly added ctrl shift
55:45slash so control slash shift i guess let me just check it here and if you don't know the
55:52shortcut you can just refer under the code you can find the options which are available
56:00okay now can you see comment with the line control plus slash is there comment with
56:04the block command ctrl shift slash yeah it is correct on ctrl shift
56:09forward slash so i say ctrl shift forward slash still not working
56:18yeah just a second
56:22okay so for multi line comment also it is uh saying control slash because this again
56:28single singles single and comment only for every line we have to give the slash right
56:32so if i say only control stars here for every line it is adding slash slash but i don't want
56:39to do like this i just want to comment all the stuff at one shot let me try from here
56:46and basically this option is disabling
56:51comment with a line control slash and comment with the block statement
56:57this option is there but it is somehow disabled okay we'll see that
57:04okay so i have not selected anything just go to the code and still it is not enabled okay
57:08so somehow it is not enabled actually if you want to block the if you want to comment block
57:14of statements normally we use this option comment with block statement control shift
57:18slash should work so that we will see later somehow it is not working fine
57:23okay so if you want to comment multiple lines also you can just select them
57:26control slash you can use and again if you want to remove them you can just select all of them
57:31i can say control slash once again or if you want to zoom it manually you can say three string is
57:38single slashes three single slashes or you can say three double slashes and don't use combinations
57:45okay either double quotations or single quotations sorry this is the one this is also commented so
57:52python will ignore this statement at the run time okay python will ignore the statement and
57:57this will also ignore let's try to execute so you will get the output only from the statement
58:05okay so this is how we need to work with the commands the first thing and then python
58:13will ignore the commands in runtime simple user just to improve the readability of the
58:17code we use the commands and then what are the different keywords available in python keywords
58:24what are the what is the meaning of keyword so keyword is nothing but a reserved word result
58:33okay result words in python what does it mean these words are having their own meaning in
58:40python so we should not use those fours for variable names or some other purpose
58:45okay keywords are nothing but a reserved verse and those words having their own meaning
58:50in python so let us see what are the different keywords are available in python there are so
58:55many keywords are there but if you want to display all the keywords in the list
58:59we can just write a simple code let me just go to the pie chart and i'll create one more program
59:06right click a new file and name it as keywords dot py
59:13and you can give any name to the file there is no naming convention nothing you can give alphabets
59:18lowercase character anything underscore spaces anything it is allowed now inside this i want to
59:24see what are the keywords are available in python 3 what are the list of keywords keywords are in
59:30the sense those keywords are reservoirs we should not use those keywords as a variable names or
59:35any other purposes but we need to know what are the keywords are available so simply we can just
59:41say print there is a predefined module in python that is called i'll talk about this modules later
59:48okay for now just understand keyword is a default module which we already have in python
59:54it is just like a package in java if you know already about java you know about packages right
59:58here we can call it as a model so keyword dot inside this we have something called a kw list
1:00:05we say again class actually so this will give you all the keywords which are available in python
1:00:12so as soon as you are using this name it is imported that class actually this class is
1:00:18present inside the keyword model and don't confuse what is class and what is module all these things
1:00:23so later on i will cover all these concepts slowly one by one so once you start learning
1:00:28object oriented programming concepts then you will understand what exactly this is okay just follow
1:00:33blindly what i'm just typing here and to access this kw list from the keyword we need to first
1:00:39import that keyword and then we can access kw list so what this will give you this will print all the
1:00:46keywords which are already available in python so let's try to execute run keywords now we can
1:00:52just look at this there are so many keywords are there and i'm copying them and try to print here
1:01:01there are so many keywords are there i'll put in multiple lines
1:01:10and scroll down you can see i have selected
1:01:12till here only so there are so many other keywords also there
1:01:20okay so i just copying them
1:01:38all right again so i'm just trying to put a comment
1:01:48okay still i have not copied all the stuff but these are the
1:01:51different keywords you can just look at this false none okay and as asset as sync await break class
1:01:59so these are the python reserved words or python keywords so we should not use this keyword for any
1:02:06other purposes because these keywords are having their own meaning in python so if you want to see
1:02:11all the keywords which are available in python we can just print this keyword dot kw list so
1:02:16that will print you all the keywords which are available in python so this will print prints all
1:02:25available available keywords in python okay so this is a simple understanding
1:02:35what is keyword so keyword is a reserved word which we cannot use it for any other purposes
1:02:41and the next most important thing is a data types every programming language
1:02:46is having some data types just like that even python is also having some data types
1:02:52like data types operators everything is there but something different here i'll tell you
1:02:59so what is the data type first of all so what is the data type suppose if you create a variable
1:03:06let's say x equal 100 what is x what is 100 100 is a value x is called a variable
1:03:12so x is a variable variable means what variable is a container which can hold some data
1:03:18so variable means is a container which can hold some data right and which will uh the python will
1:03:24allocate some memory to this variable and then we can store some data that's basically called
1:03:28as a variable so in python while defining the variables we have to know few important things
1:03:36what are those important things a variable is nothing but a reserved memory location to store
1:03:42the values as soon as you create a variable like this which will automatically assign some memory
1:03:47to this variable to store the value so variables are used to store the data and memory allocated
1:03:53when the values are stored in the variables as soon as you store some value into the variable the
1:03:57memory automatically will be allocated and every variable must have some type so what is this type
1:04:04type is nothing but a data type so every variable must have some type but in java if you create
1:04:12a variable we must specify the data type for example if i want to store a number in a variable
1:04:18we have to define that variable as an end suppose suppose if you want to store a string like this i
1:04:25want to store a string data into the variable that variable should be defined as a string
1:04:29type like this and this is basically called as a data type but in python data types are available
1:04:38but the thing is we here we no need to specify the data type so because python is having one
1:04:44very good feature which is dynamically typed language python is a dynamically typed language
1:04:51there's an another new feature which is having in python which is not there any in any other
1:04:56programming languages so what is the meaning of dynamically typed language as soon as you created
1:05:03a variable if i put some value by default this variable will be considered as an integer variable
1:05:11so you no need to write the data type similarly when you create another variable with some
1:05:16string value by default python will consider this variable as a string variable and you don't need
1:05:23to specifically say the data type but in java it is not like that so python is a dynamically typed
1:05:31programming language we have to remember this feature dynamically typed programming language
1:05:39and this feature is there only in the python programming language okay remember that so what is
1:05:44meant by dynamically typed programming language we no need to specify the data type of the variable
1:05:50but still data types are there in python what are the data types are there in python in the
1:05:54python various data types are there texture type str is the data type for numeric intender float is
1:06:01a data type if you want to store a single number integer then indeed is a data type and if you want
1:06:06to store a decimal number then float is a data type and similarly we have a list type a tuple
1:06:11dictionary a set bool these are different types are available in the coming session i will discuss
1:06:16more on this but remember like other programming languages python is also having the data types
1:06:24but it is not mandatory to specify the data type in front of the variable not required
1:06:30because dynamically the python will automatically assign the particular data type to that variable
1:06:35based on the value we provided okay that's a one very good feature which we have in python
1:06:42and one more thing is there what is that suppose x equal to 100 we put so x is a number
1:06:49right integer now after that in the x also i can put some different numbers suppose i can say
1:06:56uh i can also put some string value this is also allowed in python see initially x is a number
1:07:03but as soon as you change the value of the x automatically the x will becomes the string
1:07:08x will becomes a string so this is also part of the dynamically typed programming language
1:07:14but in java it is not possible if you define this variable x as an integer throughout the
1:07:20programming in x we should store only numbers we cannot store any other type of data in the x
1:07:26but in the python we can anytime we can change the value accordingly the data data type of the
1:07:32variable also automatically changes so this is a exact feature which we can call it as a
1:07:38dynamically typed programming language remember guys okay very very important feature from python
1:07:45so later on i will discuss all the data types like list tuple dictionary set all these things and
1:07:52if you store a string in a variable that will automatically consider the str data type if you
1:07:58store a number into the variable that variable is considered as integer type suppose if this
1:08:03number is having some decimal point that will be considered as a float type and if that variable is
1:08:09having only true or false that will be considered as a boolean type and rest of them are exactly
1:08:15used for the collections like in array in java we have arrays concept arraylist concept right so set
1:08:22like this so similarly python is also having some collection type right so this is our main feature
1:08:28which we have in python so now i'll show you one example how we need to work with this data types
1:08:34go back to the pi champ and i will create another file new file and i'll name it as data types
1:08:46dot py okay so now here let me just create some variables i will say x equal to 100
1:08:54so now what is the type of x what is the type of x in t is a type of x but how we will know the type
1:09:01if you want to know what is the type of x and what is the type python is assigned to this variable
1:09:07so if you want to know that we can simply know that how we can know that we have a function in
1:09:11the python called the type in that we can just pass the variable that will automatically gives
1:09:19you the type of x but we want to print that value right for that we have to use one more
1:09:25function called print function because whatever you keep in the print function that will print
1:09:30that as an output in the console window so type of x will give you the type of x what is the type of
1:09:38x and if you want to print that additionally we have to use a print method okay now just execute
1:09:44this and see what will happen so this will give you inter so this is belongs to integ class type
1:09:52okay so this is given in perfectly fine suppose i create one more variable y i
1:09:58have some decimal number now i want to know the type of i so what could be the type of y
1:10:04so this time i'm just writing the y now what is the type of y it should be float it should be
1:10:12float so double we don't have here okay only float we have so when i execute this which will give you
1:10:18float you can have it number any big number size is fine so this is given float
1:10:26now observe this carefully this time i am saying x y and yes equal to i say welcome
1:10:34now one more flexibility here is in python if you want to represent a string right
1:10:41we have to keep in the double quotations or single quotations also allowed this is also perfectly
1:10:47fine single quotations also allowed but what about the characters characters also you can keep in the
1:10:54single quotations or double quotations because for single character or multiple characters
1:10:59for both str is a data type for both str is a data type but in java it is not like that in java cad
1:11:07data type is different string type is different care we will include in the single quotations
1:11:12string we will include in the double quotations but here we don't have that kind of thing so
1:11:17we can just directly specify the string in the single quotation or double quotations
1:11:22similarly character also we can keep in the single quotations or in the double quotations
1:11:27anything is fine so this is a character but still i can give a double quotations
1:11:33okay anything is correct so this one is right and this one is also correct and
1:11:40here single quotation this is also correct and this is also correct sorry
1:11:51okay so this is also right and strings we can include either in single quotations or
1:11:57double quotations even single character also we can include in the double quotations or
1:12:02single quotation anything is fine okay so i just commenting this later on you can understand
1:12:09now i want to print i want to know the type of s and c also so let me just print the
1:12:15type so what is the type of yes and also i want to print the type of c so for s and
1:12:23c for both the type is str only now let us run this data types now you can see
1:12:30for string and single character also the type is str so this returns sdr means string
1:12:40okay so suppose i have one more variable called b and i'll say true so true means it should be
1:12:49upper case character remember guys so boolean value so what is a boolean type means either
1:12:54it allows only true or false so here i have ascent true here now what is the type of b
1:13:00i say print type of b i just print a type of sorry lowercase characters print type of b
1:13:11so this should be bull type boolean is nothing but a boolean type
1:13:18okay so like this python will automatically assign the data type to the variables
1:13:23based on the value we provided so we have seen that point now the dynamically typed
1:13:29programming languages we have seen one point here what is that one point we no
1:13:33need to specify the data type of the variable but based on the value we have assigned automatically
1:13:38the data type will be given to that variable by python itself and one more point is there in the
1:13:44dynamically typed programming language what is that point if you have some value in the variable
1:13:49and later on i can change that value some other type of value also you can keep
1:13:54suppose if i just look at here s equal to welcome what is the type of this variable string right
1:14:00and later on in yes i can store some number also this is also valid so what is the type of es now
1:14:09so let me show you like this see here uh take some other variable okay so for example
1:14:18some x equal to i x equal to i say one two three four so now let's type the print the type of x
1:14:26okay print type of x so what is the type of x here what is the type of x we are expecting int
1:14:34right so let's try to execute so type of x is in perfectly fine so after that i want to change
1:14:41x value to different so this again different type value so now what is the type of x what
1:14:48could be the type of x it should be string so now it should be str means it is a string
1:14:55so what we have understood based on that so if you have some value in the variable by default
1:15:00python will assign the data type but later on if you change the different type or if
1:15:05you add some different type of data again the variable data type automatically will change
1:15:11so that is also part of the this feature dynamically typed programming language but in
1:15:17java we don't have this flexibility there if you create a variable with one data type that is fixed
1:15:23we cannot change the data type of the variable we cannot change the value of the variable
1:15:30clear everyone so far so how to work with the variables and data types most important concept
1:15:38for variables i will show you one more example so are you guys clear on data types
1:15:42so that's the most important point here we no need to specify the data type for the variables
1:15:47and python will automatically assign the data types based on the values we provided [Music]
1:15:56all right now so let us discuss more on the variables so we have just to talk about the
1:16:03data types now let us discuss more on the variables let's create one more example
1:16:10go back to the pi champ and i will share all this code later okay i'll
1:16:15upload everything in the google drive you can get it from there
1:16:18so now let me just create a new file i'll name it as variables.py
1:16:26now let us see variables very very important concept
1:16:31let us say a equal to 10 a is a variable or not a is a variable which contains a 10 is a value
1:16:39b is a 20. so a is a 10 the b is 20 s equal to i store some string is it correct or not s equal to
1:16:49welcome is correct or not correct because strings we can include in the double quotations or single
1:16:54quotations perfectly fine now if you want to print the type of a b s a b yes then how what you can do
1:17:03print off type of a this will give you type of a similarly if you want to get the type
1:17:11of b i can say b if you want to get the type of s we can get the yes so when i run this
1:17:17so first one is integer second one is also integer third one is also integer so we have understood
1:17:22what exactly it is so we will get the type of the variables now let me just comment this statement
1:17:31example one let me write some comment here example one
1:17:40this you need to understand here i creating a equal to 10 okay and b is equal to 10.5 decimal
1:17:49number i'll say print a and a print b i say print a and print b so what is an output you will get a
1:17:59value is a 10 b value is equal to 10.5 so whenever i execute this code you get 10 n 10.5 perfectly
1:18:05fine now i want to print a 10 a value and b value both but i don't want to write two statements
1:18:14so instead of writing two statements for everybody suppose you have a five variables or ten variables
1:18:18you have to create five or ten statements like this to print the values of those variables
1:18:24so instead of that i want to have only one single statement that should be able to print the values
1:18:29of all the variables so is it possible in python or not yes so we can happily print the values of
1:18:37all the variables within single statement by using single statement instead of writing two statements
1:18:42let me comment these two statements and just writing a single statement print a comma b
1:18:48simple a comma b so like this you can separate or you can put all the variables by separating comma
1:18:55let me just execute which will also give the same result 10 is
1:18:58the value of the first variable 10.5 is the value of the second variable b
1:19:03a and b right so suppose here observe this i'm also commenting this code
1:19:13now look at this
1:19:20example two
1:19:25i just copied the same above code whatever i have so i say a equal to 10 b equal to 10.5 okay
1:19:33so here i'm defining multiple variables right so for example let's say a equal to 10 b equal to 20
1:19:40c equal to 30 so three variables i have created or let us say c equal to string value i have
1:19:48string value i have so three variables i have a b and c three different variables i created
1:19:56so can i create all the variables in single line so instead of a equal to 10 b equal to 20
1:20:03so instead of creating multiple variables in the multiple lines
1:20:06can we create in the single line just like above example instead of printing the variables
1:20:11in multiple lines like print a print b and c like this i have just used only one statement similarly
1:20:18instead of defining multiple variables like this can i create all these things in one single line
1:20:25yes we can do this in single line but how we can do that simply you can say
1:20:30a comma b comma c equal to 10 comma 20 comma and string value that's it so now what happens
1:20:40in the single statement 10 will be assigned to the a 20 will be assigned to the b welcome will
1:20:46be assigned to the c so instead of writing three different variables here also we have
1:20:52written three variables but within a single line we have done so now we can just print abc values
1:20:59see how much easy it is people who already know java you people definitely feel this very very
1:21:05simpler than java so instead of writing three different statement you can just write a single
1:21:09statement a b comma b comma is equal to 10 comma 20 comma welcome at this time of printing also
1:21:14we can just print a comma b comma c now when i run this you will get us values like this
1:21:21okay so in the in this example we have seen how to write a single print statement to print the values
1:21:26of all the variables in the example two we have seen how to write a single statement to define
1:21:33the multiple variables instead of writing multiple statements for multiple variables
1:21:37we have just created only one single statement which contains a multiple variables
1:21:43in example 2 now we'll see one more example example 3 i will also comment this [Music]
1:21:52see this i want to store a equal to let's say uh 100 right b equal to 100 c equal to also 100
1:22:04now how many variables we created three variables but values are same
1:22:09so if if the values are same right 100 is there for a value is 100 b value is 100 c values hundred
1:22:15so if the values are same for multiple variables the values are same for multiple variables
1:22:23instead of writing three statements you can simply write a equal to b equal to c equal to 100 single
1:22:30statement this is also perfectly right now what happens 100 will be assigned to the c
1:22:35same value will be assigned to the b same value again assigned to the a
1:22:39now a b c all three variable values are 100 only but when you have to use this statement like this
1:22:45if the values are same for all the variables then we have to use this statement like this
1:22:51now let us print a comma b comma c and then execute and see you got same values
1:23:02this is one more example one more scenario
1:23:06right so now i'll show you one more scenario let me just comment this example four
1:23:15example four
1:23:19understand this x equal to y x equal to 1 and y equal to 2 i put x 1 y 2. so two variables
1:23:26i have defined so we already know this i say print x comma y what is an output you will get
1:23:33when i say x comma y what is an output you will get x is 1 y is 2 so when i execute this
1:23:38you will say 1 comma 2 perfectly fine so this is returning 1 comma 2 right suppose i say like this
1:23:49printer y comma x i said so this will also print the same thing but the values will be interchanged
1:23:57right so 2 comma 1 is printed so this is also expected 2 comma 1 because the y values are 2
1:24:03y x values of 1 but here my requirement is i want to exchange the values between x and y
1:24:11but not exchanging the variables so i want to have the same order x comma
1:24:16y but uh instead of x value printing 1 it should print 2 and y value should becomes
1:24:221 that means i just want to do the swapping part swapping swapping of these two numbers
1:24:28but if you want to write this swapping technique in java we can write many ways but here
1:24:33it's very very simple with single statement we can do that so i want to interchange these
1:24:39values x into y and y into x so if you just print x comma y values you will just print to 1 comma 2
1:24:45but how we can exchange it you can just interchange this values you can simply say
1:24:50y comma x equal to x comma y that's it y comma x equal to x comma y then what happens
1:24:58so what is the current value of x 1 that 1 will be assigned to the first variable called y
1:25:04now what is the value of y here 2 the 2 will be assigned to the x
1:25:09now after that again try to print the x and y values and then you see the output see this first
1:25:15time it is giving 1 2 second time it is giving 2 1 so swapping is happened within single statement
1:25:22we have not written any logic here just y comma x equal to x comma y that's it swapping is done
1:25:30right so this is a another example we can also assign the values like this
1:25:38okay and same thing one more example we already discussed
1:25:42this in one variable we can store different values also right so i'll say e equal to 100
1:25:48now if you want to print a which will give you 100 right so which will give you 100 perfectly fine
1:25:56and suppose i want to change the value of a now we i'll put some string data like this now if
1:26:02you want to print ea what's the output you will get what is an output you will get here because
1:26:07earlier the a value is 100 so 100 is printed here after that i am changing a value equal to welcome
1:26:13so the latest value of a is welcome should get so now when i execute so we'll get the welcome
1:26:21because in pi uh in python we can change the value of the variable anytime
1:26:29again so that is again feature of dynamically typed programming language
1:26:34so this is the very most important term in python lives so if you go for python interview the first
1:26:40question they will ask you is what is the main feature of python so you have to tell dynamically
1:26:46typed programming language then they will ask what is dynamically typed programming language
1:26:51you have to tell two reasons one is data type you don't need to specify based on the type of
1:26:56data it will automatically second thing is the variable can have any type of data so once you
1:27:03specify one data once you add some type of data later on you can change the data also
1:27:08anything it can be string number float whatever it is so that's a dynamically programming language
1:27:16okay so this is all about the variables concept guys so today we have learned how to
1:27:25work with the comments what are the different comments right single line multiline and we
1:27:30have seen what are the different keywords are in their python and we have understood what is the
1:27:34what are the variables and data types and in the later one i will discuss
1:27:39more about this data because each register will take one session so they are very huge
1:27:43concept okay these are the fundamentals of python programming language which we need to understand
1:27:50okay so that's all for today's session guys i'm just stopping here so i will share these
1:27:55uh files so as part of today's session what you have to do is as part of your practice first try
1:28:01to install python and go through the document and try to install python and if you follow the same
1:28:07steps you will not get any issues okay it will go very smoothly and then try to install the pie jump
1:28:14pie jump is most important because we are going to use python pie champ every day and once you
1:28:20create your pycharm and launch the python and try to create a new project i have just i have shown
1:28:27you in the video so create a new python project and then create a new folders like this and try
1:28:33to create your programs and try to execute them so this will give you the basic understanding how
1:28:40exactly we have to write a program and how to execute how to execute your python program and
1:28:44so on okay so in the next session we will see a few more important concept from python all right

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