Guido van Rossum <guido@python.org>: > But in order to be a good > citizen in the world of binary operators, __or__ should not raise > TypeError; > > if the other argument implements __ror__, union() > will acquire this ability. Another possible reason is so that if a subclass overrides __or__, union() will get the new behaviour too. Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg@cosc.canterbury.ac.nz +--------------------------------------+
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