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I want to import a function named ret() from a module called mainprog into another module named windw.

So I did it like this in the windw module:

from mainprog import ret

This is supposed to work right?
But there is an infinite loop in the mainprog module.
So, even without calling the function I imported, it just keeps loading forever when I try to run the windw module.

So I guess it runs the whole mainprog module when I import? I need help to avoid this.

Viqtoh
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2 Answers2

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You are doing fine, all you need to do is make the loop not execute unless you are running the code by itself What you need to do is add a 

if __name__ == '__main__':
    while True:

This will make your program work as before, but make it possible to import functions within your code

Jose Angel Sanchez
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You must make sure that the file mainprog.py does not have anything besides definitions of functions, constants and a __main__ guard.

If you have anything else defined like so:

do_something()
def ret():
    ...

Be sure to convert it to:

def ret():
    ...
if __name == '__main__':
    do_something()
Felix
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