[Python-ideas] unify usage of mutable and immutable objects

[语言破碎处]

> We are not going to change the implementation of sets so fundamentally,
> mostly because having O(1) behaviors is so nice (add, remove, membership
> check, etc).

What I want are such interfaces (no matter with standard set):
    class IDynSet:
        # "Dyn" means it have methods like ipop_both
        def ipop_both(self):
            if hasattr(self, 'pop_mutable'):
                elem = self.pop_mutable()
            elif hasattr(self, 'ipop_immutable'):
                elem, self = self.ipop_immutable()
            else: raise
            return elem, self

    class IMutableDynSet(IDynSet):
        def pop_mutable(self):
            return self.pop()

    class IImutableDynSet(IDynSet):
        def ipop_immutable(self):
            elem, new = self.ipop() # ipop not pop
            return elem, new



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