I've noticed that I can update() a set with a list but I can't extend a set with a list using the |= assignment operator.
>>> s = set() >>> s.update([1,2,3]) >>> s set([1, 2, 3]) >>> s |= [4,5,6] Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for |=: 'set' and 'list' >>> s |= set([4,5,6]) >>> s set([1, 2, 3, 4, 5, 6]) Why is that? Doesn't the |= operator essentially map to an update() call? Skip -- http://mail.python.org/mailman/listinfo/python-list