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pip3 install packed


from packed import packable

@packable  # 1) register class
class EqualMatcher:
    def __init__(self, expected):
        self._expected = expected

    def match(self, actual):
        return actual == self._expected

    def __packed__(self):  # 2) pick fields
        return {"expected": self._expected}


from packed import pack

matcher = EqualMatcher("banana")
packed = pack(matcher)
# -> send «packed» over network


from packed import unpack

# <- recieve «packed» as binary
matcher = unpack(packed)
assert matcher.match("banana") is True

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