[Python-ideas] add __contains__ into the "type" object
steve at pearwood.info
Tue Feb 28 18:12:50 EST 2017
On Wed, Mar 01, 2017 at 07:02:23AM +0800, 语言破碎处 wrote:
> where we use types?
> isinstance(obj, T);
> # issubclass(S, T);
> Note that TYPE is SET;
What does that mean? I don't understand.
> if we add __contains__ and __le__ into "type",
> then things become:
> obj in T;
But obj is **not** in T, since T is a type, not a container.
"is-a" tests are not the same as "in" tests. They are completely
The Wikipedia page on is-a is terribly complicated, but folks may get
something from it:
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