New submission from Serhiy Storchaka:
For now C implementation of OrderedDict totally overrides Python implementation.
>>> import collections
>>> collections.OrderedDict.__init__
<slot wrapper '__init__' of 'collections.OrderedDict' objects>
The only way to get Python implementation of OrderedDict is to block the
_collections module and reload the collections module.
>>> del sys.modules['collections']
>>> del sys.modules['collections.abc']
>>> sys.modules['_collections'] = None
>>> import collections
>>> collections.OrderedDict.__init__
<function OrderedDict.__init__ at 0xb6f6da4c>
But this also blocks collections.deque, collections.defaultdict, and the
acceleration of collections.Counter.
As long as C implementation of OrderedDict still has some bugs (and I'm not
sure we will have fixed all them before releasing 3.5.1), I think it would be
good to have a workaround for applications that encounter one of still not
fixed bugs.
I propose to keep a reference to Python implementation as
collections._OrderedDict. This is not a public interface and we don't promise
existing this name in future releases. This is just a way to make a workaround
for the time while C implementation is not stable enough. I hope we will got
rid from it in 3.7.
A workaround for an application that suffers from OrderedDict bug:
import collections
try:
collections.OrderedDict = collections._OrderedDict
except AttributeError:
pass
----------
components: Library (Lib)
files: OrderedDict_python_impl.patch
keywords: patch
messages: 254645
nosy: eric.snow, rhettinger, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Keep the link to Python implementation of OrderedDict
type: enhancement
versions: Python 3.5, Python 3.6
Added file: http://bugs.python.org/file41038/OrderedDict_python_impl.patch
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<http://bugs.python.org/issue25623>
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