Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:
bpo-44782 was opened about the `class LRU(OrderedDict)` in the OrderedDict
docs, and its pop() method failing.
I think Serhiy's patch here (before revert) may be a good idea (to re-apply).
I think it is reasonable to ignore user-implemented dunder methods from
subclasses.
Concrete type implementations generally do not behave as mix-ins:
def never_called(self, *args):
print("Never called.")
raise ZeroDivisionError
class MyList(list):
__setitem__ = __delitem__ = __getitem__ = __len__ = __iter__ =
__contains__ = never_called
class MyDict(dict):
__setitem__ = __delitem__ = __getitem__ = __len__ = __iter__ =
__contains__ = never_called
class MySet(set):
__setitem__ = __delitem__ = __getitem__ = __len__ = __iter__ =
__contains__ = never_called
L = MyList([5, 4, 3, 2])
L.sort()
L.pop(1)
L.insert(0, 42)
L.pop()
L.reverse()
assert type(L) is MyList
D = MyDict({"a": 1, "b": 2, "c": 3})
assert D.get(0) is None
assert D.get("a") == 1
assert D.pop("b") == 2
assert D.popitem() == ("c", 3)
assert type(D) is MyDict
S = MySet({"a", "b", "c"})
S.discard("a")
S.remove("b")
S.isdisjoint(S)
S |= S
S &= S
S ^= S
assert type(S) is MySet
----------
nosy: +Dennis Sweeney
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<https://bugs.python.org/issue27275>
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