Where I put that code on gist. To pull it off, you see that I subclass dict, and define a decorator that pulls out and sorts the first argument. After that it is just decorating the '__setitem__','__getitem__',and '__delitem__' methods. This lets us do nice things now:

>>> z = Links() >>> z[1,2] = 5 >>> z[4,3] = 10 >>> z {(1, 2): 5, (3, 4): 10} >>> z[2,1] 5 >>> z[1,2] 5 >>> z[2,1] = 11 >>> z {(1, 2): 11, (3, 4): 10} >>> del z[2,1] >>> (3,4) in z True >>> (4,3) in z True >>> z {(3, 4): 10} >>> z[5] = 1 Traceback (most recent call last): File "", line 1, in File "links.py", line 10, in orderedversion assert hasattr(first,"__len__"), "Key must be iterable" AssertionError: Key must be iterable >>> z[4,4,3] = 1 Traceback (most recent call last): File " ", line 1, in File "links.py", line 11, in orderedversion assert len(first)==2, "Key must be 2-tuple" AssertionError: Key must be 2-tuple >>> z {(3, 4): 10}

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