Fraser Tweedale added the comment:
and here's a patch for python3 (the earlier patch is for the 2.7 branch).
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Added file: http://bugs.python.org/file30773/dictview-set-sub-test-python3.patch
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Python tracker
<http://bugs.python.org/is
New submission from Fraser Tweedale:
The Python documentation states that set-like dictionary view objects support
set difference (-), however, this behaviour is untested.
Add some tests for this behaviour.
(This issue was discovered because PyPy doesn't support (-) for dictviews, yet
