[issue17343] Add a version of str.split which returns an iterator

[Raymond Hettinger]

Raymond Hettinger added the comment:

-1 on os.walk returning an iterator.  The API is already a bit challenging for some and our experience with itertools.groupby() is that returning an inner iterator can be very confusing.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17343>
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