Raymond Hettinger <[email protected]> added the comment:
> To solve the problem, KeysView and ItemsView need
> to override _from_iterable to return a set instead
> of a new view.
Thanks for the good analysis and suggested fix. I believe both are correct and
they match the behavior of real dictionaries.
def _from_iterable(self, it):
return set(it)
Proposed tests to match real dicts:
x = MySimpleMapping() # from stuzback's example
x['red'] = 5
y = x.keys()
assert isinstance(y, collections.Set)
assert not isinstance(y, collections.MutableSet)
z = x.keys() | {'orange'}
assert type(z) is set
----------
priority: normal -> high
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue9214>
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