def __iand__(self, other):
if not collections._set_binops_check_strict(self, other):
return NotImplemented
want, have = self.intersection(other), set(self)
remove, add = have - want, want - have
for value in remove:
self.remove(value)
for value in add:
self.add(value)
return self
def __ixor__(self, other):
if not collections._set_binops_check_strict(self, other):
return NotImplemented
want, have = self.symmetric_difference(other), set(self)
remove, add = have - want, want - have
for value in remove:
self.remove(value)
for value in add:
self.add(value)
return self
def __isub__(self, other):
if not collections._set_binops_check_strict(self, other):
return NotImplemented
for value in other:
self.discard(value)
return self
