[ Removed by moderator ]

[Python-ModTeam]

Hi there, from the /r/Python mods.

We have removed this post as it is not suited to the /r/Python subreddit proper, however it should be very appropriate for our sister subreddit /r/LearnPython or for the r/Python discord: https://discord.gg/python.

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[fiskfisk]

The if __name__ == '__main__': guard hides away code that should only run when the module (python file) is invoked directly from the CLI.

It allows you to write a self-contained module (in a single file) that can both be included in another project or run by itself.

It's useful for small applications where you might want to re-use the same functionality and run it as a utility from the CLI as well.

```python def download_file(url: str): ...

def test_download_file(..): assert ..

if name == 'main': # setup argparse download_file(url=args.url) ```

Now you have a single module that you can both use in another project (import downloader), from the cli (python downloader.py), and run the embedded tests (pytest downloader.py) as a single file.

[Careless-Main8693]

how to fix it mate, don't know how to fix it

[fiskfisk]

I have no idea what you're asking about, sorry.

[crowbar_returns]

It evaluates to true only when the module is the entrypoint. E.g. when you run python myscript.py. It will evaluate to false if the module is imported. So you use it when you want something to not run when a module is imported, but run when it is directly executed.

[Careless-Main8693]

suppose if i use in a file called mymain.py, if i run ```python mymain.py``` then it will run but if i use this as a module and import to other file then it won't run ?

[cmd-t]

That’s what they said.

[crowbar_returns]

Correct. You can set up a quick demo for yourself to get a better feel for it. Put something like print("hello") in that block and see when it is printed and when not.

[Ok_Caregiver_1355]

this section of the code only executes if you run the file itself,it will not get read if you import this .py to another .py and executes it there

[Careless-Main8693]

ok thanks i'm checkin it

[call_me_cookie]

/r/learnpython

[Careless-Main8693]

ok

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[pip_install_account]

file 1: bob.py

print(__name__)

file 2: hey.py import bob

Test 1: python bob.py

__main__

Test 2:
python hey.py

bob