[issue23793] Support __add__ for deques.

[Raymond Hettinger]

New submission from Raymond Hettinger:

One more step towards making the deque API a little closer to that for lists:
  
    >>> deque('abc') + deque('def')
    deque(['a', 'b', 'c', 'd', 'e', 'f'])

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assignee: rhettinger
components: Extension Modules
files: deque_add4.diff
keywords: patch
messages: 239419
nosy: rhettinger
priority: normal
severity: normal
stage: patch review
status: open
title: Support __add__ for deques.
type: enhancement
versions: Python 3.5
Added file: http://bugs.python.org/file38712/deque_add4.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23793>
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