[docs] [issue17359] Mention "__main__.py" explicitly in command line docs

[Nick Coghlan]

Changes by Nick Coghlan <ncoghlan at gmail.com>:


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title: Mention "__main__.py" explicit in command line docs -> Mention "__main__.py" explicitly in command line docs

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17359>
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