Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python

Yoon Choi
Yoon Choi
1,649 Points

Why don't you have an explanation for dunder name and dunder main?

Can we have a discussion on what name and main is?

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 67,989 Points

Good question! As answered here and here,

This is a common python idiom to detect if a module is imported or being executed directly.

When a python module is imported into another module, its __name__ attribute is set to be the same as the module name. When a python module is executed, the top level module attribute __name__ is changed to be "__main__". This way a module can tell the difference between if it is being imported or executed.

The python idiom

if __name__ == "__main__":
     main()

says, "if my __name__ attribute has been changed to the string "__main__", then execute the function main(). The "pass" would be replaced with the code to be executed.

Post back if you have more questions. Good luck!!