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[no audio]

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Friends here we are going to see

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how to run Python Script on your Windows

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operating system or on Linux operating system,

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right, or any other Unix-like systems. First

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let me go with Windows operating system.

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So already we know from our previous videos how to run Python

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Script on your Windows operating system, and that too from

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command line guys.

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So if you want to run your Python Script from GUI editors, in

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GUI editor itself you have an option to run your Python

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Script. But first of all, we are going with command line.

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Then later after some time

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we will see how to use Python Script in GUI editors, or how

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to run your Python Script using your GUI editors. For time

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being we are going to work with from command line.

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Let me open my Windows command line first.

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[no audio]

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So from our previous videos already

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we have some Python Script under this location.

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Let me enter into that and see some Python Scripts are there.

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Let me take simply 'usage_of_comments'

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Let me take a simple example,

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[no audio]

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or type simply 'hello', this is one Python Script, right?

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So if you want to run Python Script from Windows, first thing

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you have to check it whether 'python --version',

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if it is working. Then directly

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you can run 'python', then your script name.

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[no audio]

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Sometimes if you run 'python', right, let's say something like

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this, and if you run, so you will get "python is not recognized

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as an internal or external command".

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Of course, I have given some wrong name.

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But sometimes if you run in this way, 'python --version',

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this command, you will get this output.

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So at that time how you can run means, nothing

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is there, just simply provide complete path of your 'python',

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where you install your 'python.exe'.

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[no audio]

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You will get your output.

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Or simply copy this path,

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if you want to work like this, if you want to work like this,

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what you have to do is, just to go to your 'c',

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right, then there

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[no audio]

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just 'C: Local Disk',

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so where you installed your Python, Python 3.7. So here you have

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Python, right? Copy this path. Copy this path,

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and click on 'This PC->Properties'. So this is on your Windows guys.

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'Advanced system settings->

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[no audio]

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Environment Variables->

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PATH'. You can edit this 'PATH'.

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So already I added that, right?

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That's why no need to add any extra path.

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If you want to add once again, you can add it. Say simply 'New'

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in this way. But already we have that Python 3.7. Just simply

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I'm canceling. So once if you add your path here, then

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by reopening your terminal your Python will work in this

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way 'python --version'.

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So if you get in this way, now we are ready to run your

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Python Script from your Windows operating system, from command

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line of your Windows operating system in this way.

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Simply 'python ', your Python Script.

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So that is very simple to run your Python script on your

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Windows operating system.

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Let me take same Python Script where we have that,

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and I'm going to copy this to your Unix-like systems.

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Now this is my Unix-like system.

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Let's say, see that. What is my operating system? 'uname', right?

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Now what I am doing is, let me create here

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also some Python Scripts.

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So this is my in Linux box terminal, guys.

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Sorry, what happened?

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[no audio]

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'bash mkdir'.

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I'm not sure why it has happened.

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No problem. Just now we created called 'PythonScripts'.

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Let me enter into that.

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[no audio]

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So we don't have anything.

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Let me create simply, so guys just observe that whether 'vi'

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is there or not.

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Yes, it is there. 'vim' is there or not?

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Both are there. You can use either 'vi' or 'vim' editors on your

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Unix-like systems. Now,

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I am using 'vim' because if you use 'vim' no, it will give some colors.

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Simply I'm writing 'hello_world.py', and something I am

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pasting your lines.

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So already we have this code from your Windows operating system.

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Now guys, after writing your Python Script just check it

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whether you have Python or not.

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So simply 'python', by default you will get any one of the

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Python versions on Unix-like systems.

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That's why if you run 'python', you're getting some 2.7.,

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whatever it maybe, any version.

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[no audio]

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So already we know how to install Python 3 on your Unix-like

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systems. I already installed and we have one video for that,

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right. Just go through that 'How to install your Python 3'. Right.

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Now I want to run my Python Script using Python 3.

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Simply 'python3 ', your script name.

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This is one way. If you want to run your Python Script using

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Python 2, simply 'python ', script name. Guys

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this is on your Unix-like systems.

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Don't get confused.

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[no audio]

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Guys, this is one way, I mean the same way how you are running your

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Python Script on your Windows operating system.

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So now, as of now whatever we discussed, I mean to run your

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Python Script this is the common procedure on your Windows

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as well as Unix-like systems. But in your Unix-like systems,

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you have one extra procedure also to run your Python Scripts.

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What is that means? So before running your, before writing

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your Python Script, just check it

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which Python 3 you are having. This is the location, right?

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Copy that. Open your script. Very first line just mention

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[no audio]

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in this way '#!', then your path where your

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Python is there, after that just provide execution

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permission for your file.

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Now you can run your script in this way, './hello_world.py'.

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No need to provide 'python ', because already inside

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of our script very first line we mentioned about Python, which

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Python you want to use to run your script. You're getting

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output, no? Observe your script.

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Right. So we mentioned, so here you can mention whatever the Python

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you need to run your lines.

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So I want Python 3 to run my code,

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that's why very first line with this symbol, '#!'

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I am mentioning my Python path, and this line is called 'Shebang

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Line'. The purpose of this line is, you are mentioning an interpreter,

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which interpreter you are going to use to run your Python

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Script. That's it.

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[no audio]

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Right. So if you want to use some any extra, other Python which,

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actually we mentioned some default Python version, Python

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version inside of your script, right, like Python 3.

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I don't want to use Python 3.

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I want to use Python 2. Then simply externally

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you can mention 'python', and then your "hello",

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it will also work.

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If you mention inside of your script we'll take that one.

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If you don't mention, you can run from outside. Even though

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if you have, if you mention from outside we'll take this Python.

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That's it. Okay. So guys on your Unix-like systems,

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anyway you know the common procedure for your Windows as

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well as Linux, simply 'python', required 'python', then script name.

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[no audio]

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But on Unix-like systems,

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[no audio]

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this is the best way. That is first find which Python you

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want. If you want to go with Python 2, just type which Python,

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or Python 3.

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So whatever the path you are getting, right?

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Let's say some script 'hello.py'. So very first line mention

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your which Python 3 output, that is location of your Python,

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[no audio]

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and this line is called 'Shebang Line'.

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[no audio]

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Okay.

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[no audio]

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Just comment that line, 'shebang line'.

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So the purpose of Shebang Line is which type of interpreter

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you're using to run the lines which are there in your code.

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Let's say simply 'print("hello")'

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This is also one simple Python Script, just to display, "hello".

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So after this what you have to do is, just provide execution

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permission for your file,

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[no audio]

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whatever the script you have. Then run

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'hello.py'. Okay.

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So guys here I am providing './' because I am running

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from the current location where my Python Script is there.

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So here my Python Script is there, that's why I am running './hello'.

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Suppose you are in the home location, you are in a different

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location, and your Python Script is there in a different

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location. At that time if you want to run your Python Script

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from any one of your path what you have to do is, you have

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to provide complete path.

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That's it.

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So if you are in the location of where your Python is there,

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here we don't have Python, right?

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[no audio]

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If you don't have Python Script in this location, then you

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have to run always your Python Script by providing your complete path,

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or just enter into your required location where you have your

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Python, from there

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you can run simply './'.

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Right. So guys

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this is the way how you can run your Python Scripts on your

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Windows and Unix-like systems, okay.

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Okay guys, thank you for watching this video.

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[no audio]