diff options
Diffstat (limited to 'Lib/_abcoll.py')
| -rw-r--r-- | Lib/_abcoll.py | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py index e9234af382..73e668c11c 100644 --- a/Lib/_abcoll.py +++ b/Lib/_abcoll.py @@ -305,18 +305,24 @@ class MutableSet(Set): return self def __ixor__(self, it): - if not isinstance(it, Set): - it = self._from_iterable(it) - for value in it: - if value in self: - self.discard(value) - else: - self.add(value) + if it is self: + self.clear() + else: + if not isinstance(it, Set): + it = self._from_iterable(it) + for value in it: + if value in self: + self.discard(value) + else: + self.add(value) return self def __isub__(self, it): - for value in it: - self.discard(value) + if it is self: + self.clear() + else: + for value in it: + self.discard(value) return self MutableSet.register(set) |