The module __main__ is somewhat special. It's there from the very beginning
(so far as I can tell).
$ python3 -c 'import __main__; print(__main__)'
<module '__main__' (built-in)>
And without importing __main__.
$ python3 -c 'import sys; print(sys.modules["__main__"])'
<module '__main__' (built-in)>
In light of this, it seems to me that the technical implementation of the
proposal amounts to
1. When creating a new module object, set
__main__ = False
2. When initializing the built-in __main__ module, set
__main__ = True
I don't see a technical problem in the implementation of this idea. (I
suspect the same rules will also work for C-coded modules.)
Whether a good idea or not is another question.
--
Jonathan
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