Overriding set methods in Python

Question

I want to create a custom set that will automatically convert objects into a different form for storage in the set (see Using a Python Dictionary as a key non-nested) for ba

Answer 1

In Python 2.6:

import collections
print collections.MutableSet.__abstractmethods__
# prints:
# frozenset(['discard', 'add', '__iter__', '__len__', '__contains__'])

subclass collections.MutableSet and override the methods in the list above.

the update method itself is very easy, given that the bare minimum above is implemented

def update(self, iterable):
    for x in iterable:
        self.add(x)