[New-bugs-announce] [issue22766] collections.Counter's in-place operators should return NotImplemented for unsupported types

[Joshua Chin]

New submission from Joshua Chin:

Currently, in-place operations on 'collections.Counter' with unsupported types raises an 'AttributeError'.

Example:
>>> import collections
>>> counter = collections.Counter()
>>> counter += 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/collections/__init__.py", line 709, in __iadd__
    for elem, count in other.items():
AttributeError: 'int' object has no attribute 'items'

Instead, it should return 'NotImplemented' if 'other' is not a 'collections.Counter'

----------
components: Library (Lib)
files: counter.patch
keywords: patch
messages: 230271
nosy: Joshua.Chin
priority: normal
severity: normal
status: open
title: collections.Counter's in-place operators should return NotImplemented for unsupported types
type: behavior
versions: Python 3.4
Added file: http://bugs.python.org/file37075/counter.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22766>
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