Dennis Sweeney <[email protected]> added the comment:
What about returning another dict_items instead of a set? As in (using the
convention `d.items().mapping is d`):
dict_items = type({}.items())
def __xor__(self: dict_items, other):
if isinstance(other, dict_items):
new = self.mapping.copy()
MISSING = object()
for key, value in other:
existing = new.get(key, MISSING)
if existing is MISSING:
# (key, value) in (other - self)
new[key] = value
elif existing == value:
# (key, value) in (self & other)
del new[key]
else:
# (key, value) in (self - other)
new[key] = value
return new.items()
else:
return set(self) ^ set(other)
I believe this wouldn't require any re-hashing. It would also allow for
non-hashable values.
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Python tracker <[email protected]>
<https://bugs.python.org/issue40889>
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