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

[R. David Murray]

R. David Murray added the comment:

For what it is worth, I am currently writing some email tests and it would certainly be convenient to have this.  Of course I *can* define it locally in the the test file.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18652>
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