Matteo Dell'Amico <[email protected]> added the comment:
I suggest solving the problem by changing the implementation to:
def __iand__(self, c):
self -= self - c:
or to
def __iand__(self, c):
for item in self - c:
self.discard(item)
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Python tracker <[email protected]>
<http://bugs.python.org/issue5647>
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