[issue24632] Improve documentation about __main__.py

[Ethan Furman]

Ethan Furman added the comment:

RDM noted:
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> The surprising thing is that __main__ works without there being an
> __init__.  I didn't know that, assumed it wasn't true, and so never
> tried it.

I think this is due to PEP 420 Namespace Packages.

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<http://bugs.python.org/issue24632>
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