[Python-ideas] Re: Fwd: Re: Global flag for whether a module is __main__

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__)' And without importing __main__. $ python3 -c 'import sys; print(sys.modules["__main__"])' 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