Use frozenset as a pair in python

Question

I would like to make a pair of two elements. I don\'t care about the order of the elements, so I use frozenset.

I can think of the following two methods t

Answer 1

Just to elaborate on an above comment, and assuming your elements are easily sortable, you could make an unordered pair class from tuple using:

class Pair(tuple):
    def __new__(cls, seq=()):
        assert len(seq) == 2
        return tuple.__new__(tuple, sorted(seq))

Then you get:

>>> Pair((0, 1))
(0, 1)

>>> Pair((1, 0))
(0, 1)

>>> Pair((0, 1)) == Pair((1, 0))
True