On 05/03/12 19:36, Peng Yu wrote: > list(a_set) > > When convert two sets with the same elements to two lists, are the > lists always going to be the same (i.e., the elements in each list are > ordered the same)? Is it documented anywhere?
Sets are defined as unordered which the documentation[1] confirms. A simple test seems to show that on cPython2.6 on this box, sets with 1000000 elements converted to lists without sorting seem to compare as equal (i.e., cPython is sorting), but I don't see any guarantee that this should hold for other implementations, so I'd sort first to ensure the intended behavior. -tkc [1] http://docs.python.org/library/stdtypes.html#set-types-set-frozenset """ Being an unordered collection, sets do not record element position or order of insertion. """ -- http://mail.python.org/mailman/listinfo/python-list
