[issue18606] Add statistics module to standard library

[Mark Dickinson]

Mark Dickinson added the comment:

(We don't seem to care too much about the distinction in general, though:  there are a good few places in the std. lib. where obj.__index__() is used instead of the more correct type(obj).__index__(obj).)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18606>
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