"Stefan Behnel" > I generally believe that many programmers will > silently expect frozenset() to be (and become) more efficient than set() - in > whatever regard: processing, memory, etc.
That belief is without foundation. Except for mutating methods and hashing methods, both set() and frozenset() share the same underlying code and data structure. In this respect, they differ from list() and tuple() which have no shared code and has two substantially different data structures. Raymond Hettinger -- http://mail.python.org/mailman/listinfo/python-list
