Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Here's pure python code for experimentation:

    from marshal import dumps, loads

    def marshal_set(s):
        return dumps(sorted(s, key=dumps))

    def unmarshal_set(m):
        return frozenset(loads(m))

    def test(s):
        assert unmarshal_set(marshal_set(s)) == s
        
    test({("string", 1), ("string", 2), ("string", 3)})

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37596>
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