[issue18652] Add itertools.first_true (return first true item in iterable)

[Antoine Pitrou]

Antoine Pitrou added the comment:

> How large will be a C implementation of this one-line function?
> 
> I'm still -1 for polluting the itertools module with trivial
> combinations of existing functions.

The solution is to move the current itertools to _itertools and have a
companion itertools.py.

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<http://bugs.python.org/issue18652>
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