[Python-Dev] itertools predicates (original) (raw)
Francisco Couzo franciscouzo at gmail.com
Wed Nov 2 18:03:27 EDT 2016
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Some functions that take a predicate from itertools accept None as its predicate:
list(itertools.filterfalse(None, range(10))) [0] list(itertools.groupby([0,0,1,1], None)) [(0, <itertools._grouper object at 0x7fedc2047198>), (1, <itertools._grouper object at 0x7fedc2 0471d0>)]
While others don't:
list(itertools.dropwhile(None, range(10))) Traceback (most recent call last): File "", line 1, in TypeError: 'NoneType' object is not callable
I'd be interested in writing a patch to make itertools more consistent if there's a consensus.
I see two possible solutions:
- Either remove None as a predicate parameter, which would not be backwards compatible.
- Or make the functions that don't accept None start accepting it. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20161102/494071f5/attachment.html>
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