Python multimethods (Clojure style)

multimethods.py

class MultiMethod:

    def __init__(self, func):
        self.func = func
        self.methods = {}

    def __call__(self, *args, **kwargs):
        return self.methods[self.func(*args, **kwargs)](*args, **kwargs)

    def method(self, case):
        def method_adder(func):
            self.methods[case] = func
            return self
        return method_adder


to_string = MultiMethod(lambda x: x.__class__)

@to_string.method(str)
def to_string(self):
    return "string"

@to_string.method(int)
def to_string(self):
    return "integer"

print(to_string("hi"))
print(to_string(1))