Python. Area of ​​visibility. How to access variable from __main__ section?

Question

Python

The situation seems to be the simplest, but nothing happens. Help me please.
main.py

b = 2
if __name__ == '__main__':
    a = 1
    print(a, b)

If we run from the main.py module, we get, this is understandable
>>> 1 2
But if we try to call the variable a from the add.py module
add.py

import main

print(main.a)
print(main.b)

We get an error

>>> print(main.a)
>>> AttributeError: module 'main' has no attribute 'a'

Answer 1

you don't declare "a", where does it come from?

Answer 2

Scope of view has nothing to do with it.
If a module is not run directly, but is imported from another module, then its __name__ attribute will not be equal to "__main__", and everything that goes inside the condition will simply not be executed, and the 'a' variable will not be created at all.
Actually, the if __name__ == '__main__' construct is used when they want some logic to be executed ONLY if the module is launched directly, and not imported.