False positive E0601: used-before-assignment when assignment of variables is inside if __name__ == "__main__":

[shatakshiiii]

Bug description

Pylint version 3.0.0a6 seems to produce an used-before-assignment error when variables are assigned within
if __name__ == "__main__": function and later used in different functions.

This is coming from latest pylint v3.0.0a6 (since there is no such error in previous pylint versions)

Example code to reproduce this error:

def foo():
    print(x-y)

def main():
    print(x+y)
    foo()

if __name__ == "__main__":
    x = 20
    y = 10
    main()

Logging this issue here to get more context around this, as this is just a false-positive with v3.0.0a6 or something that pylint is aiming to trigger in its newer versions (As the above code format is supported in python).

Configuration

No response

Command used

pylint example.py

Pylint output

************* Module example
example.py:2:10: E0601: Using variable 'x' before assignment (used-before-assignment)
example.py:2:12: E0601: Using variable 'y' before assignment (used-before-assignment)

Expected behavior

Pylint should not trigger used-before-asssignment error.

Pylint version

pylint 3.0.0a6
astroid 2.15.2
Python 3.9.0 (default, Oct  6 2022, 15:58:26)

### OS / Environment

Fedora 37

### Additional dependencies

_No response_

[jacobtylerwalls]

Thanks for the question. This is intentional as of #6677. You're correct that this executes just fine when run from the CLI, but any other uses will raise NameError:

>>> import a
>>> a.foo()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/jacobwalls/pylint/a.py", line 2, in foo
    print(x-y)
          ^
NameError: name 'x' is not defined

[shatakshiiii]

Thanks for the explaination @jacobtylerwalls !