Raymond Hettinger added the comment:
This looks like a bug in Python 2.7:
# Python2.7
>>> from collections import Set
>>> isinstance({1:2}.viewitems(), Set)
False
# Python3.5
>>> from collections import Set
>>> isinstance({1:2}.items(), Set)
True
I think the dictitems object needs to be registered as a Set.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24286>
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