IMHO there are important differences:
A generic class is a "constructor" of a class given a complete class, to be instantiated at some later point; also, in Python the type parameter cannot be directly inspected;
A metaclass is a "constructor" of a class given a set of definitions, to be instantiated immediately - inspection is allowed and usually necessary. 

- Elazar

On Tue, 28 Jan 2020 at 01:05, Saul Shanabrook via Typing-sig <typing-sig@python.org> wrote:
Ah, I seem to have not added a name to my account, it should be fixed now.

I don't see how you would be able to do the same work-around though for `__init__`, to allow the `MyCustomClass[int]()` to be differentiated at runtime from `MyCustomClass[str]()`

Was it discussed somewhere why generic type are not implemented as metaclasses? It seems like if they were, then you would be able to do this, by simply taking `type(self)` to give you back the generic type. Also, from a conceptual perspective, if I squint my eyes, generic classes seem like they should be metaclasses, since they are basically functions that return classes, just with a different syntax than normal function calls for stylistic purposes.
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