[issue18882] Add threading.main_thread() function

[Andrew Svetlov]

Andrew Svetlov added the comment:

I did not received review email, sorry.
Docstring is added.
BTW 'threading' module has almost no docstrings, that's why I've added only docs at first.
Do you think docstrings should be added to all public functions?
Thanks.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18882>
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