gistfile1.py

import cPickle as pickle
from UserDict import UserDict
class HashableDict(UserDict):
    def __hash__(self):
        return hash(pickle.dumps(dict([(k,self.data[k]) for k in sorted(self.data.keys())])))


>>> d1 = HashableDict({'a':1, 'b':2, 'c':3})
>>> d2 = HashableDict({'a':1, 'b':2, 'c':3})
>>> d3 = HashableDict({'a':1, 'b':2, 'c':4})
>>> set([d1,d2,d3])
set([{'a': 1, 'c': 3, 'b': 2}, {'a': 1, 'c': 4, 'b': 2}])

Set friendly dictionaries in Python