[issue5670] Speed up pickling of dicts in cPickle

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

I ported the patch to py3k. In addition, I added a special-case when the
dict contains only one item; you probably want this special-case in the
trunk version as well.

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nosy: +alexandre.vassalotti
Added file: http://bugs.python.org/file13593/pickle_batch_dict_exact_py3k.diff

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