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

Posted by Ankush Sharma
Ankush Sharma
844 Points

i am not understanding.Please help

when in second _app module ,i "import app,it prints both from second_app module and from app module. but when i am using dunder name method then it is not working. app module program:

def print_hello():
    print("hello from the app")
print(__name__)
if __name__ == "__main__":

    print_hello()

Second_app module program:

import app
print("hello from second app")
app.print_hello()

and why he in second_module use :app.print_hello()

[MOD: added ```python formatting -cf]

KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,971 Points

Can you format your code using markdown?

2 Answers

Brian Davis
Brian Davis
1,628 Points
Brian Davis
Brian Davis
1,628 Points

Is it me, or does this not make any sense? I'm not sure if he's not explaining it well, and/or, the python developers just picked a ridiculous way to engineer this topic.

Jay zhang
Jay zhang
4,109 Points
Jay zhang
Jay zhang
4,109 Points

in second_app module the reason that he uses app.print_hello() was basically to recall the function thats in the app.py file.

its very easy to understand why you're using _ _ name _ _ == _ _ main _ . its basically just a conditional check. when you uses _ _ _name _ _ it checks the current condition of the module, ie, if you're running app.py(which contains print(_ _ name _ )) then the output would be _ _ _main _ , but if you're in second_app.py, the (print( _ name _ _).) would output the filename, which its app(no .py at the end).