Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Conditional Check

9,780 Points

We use this conditional check everytime??

So that means, in all files that I import, I should always add this conditional check for ALL the code except the code that is not in a function or class definition??

I mean you always want to call imported functions and access imported classes individually when you need them in your main.py or not?? This gets me really confused.

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

You will want to use the conditional check

if __name__ == __main__:

to isolate code that you wish to run only if this module is the topmost module executed. Code protected by this conditional will not run if the module is imported into another module.

Many library modules do not have this conditional check since they’re never intended to be run directly as the topmost module.

Post back if you need more help. Good luck!!!