[Python-ideas] add __contains__ into the "type" object

[语言破碎处]

where we use types?
    almost:
        isinstance(obj, T);
        # issubclass(S, T);

Note that TYPE is SET;
    if we add __contains__ and __le__ into "type",
    then things become:
        obj in T;
        # S <= T;  # if only not misleading to a total ordering

example:
    def __getitems__(self, i):
        if i in Integral:
            ...
        elif i in slice:
            ...

# Save "(,)". Really, I prefer to type "lambda:;" than "()".
# I fail to modify the "type" object, since it is a C-object.


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