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bpo-39481: Implementation for PEP 585 (#18239)

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This implements things like `list[int]`,
which returns an object of type `types.GenericAlias`.
This object mostly acts as a proxy for `list`,
but has attributes `__origin__` and `__args__`
that allow recovering the parts (with values `list` and `(int,)`.

There is also an approximate notion of type variables;
e.g. `list[T]` has a `__parameters__` attribute equal to `(T,)`.
Type variables are objects of type `typing.TypeVar`.
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Guido van Rossum 2020-04-07 09:50:06 -07:00 • committed by GitHub
parent 9cc3ebd7e0
commit 48b069a003
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@ -734,6 +734,8 @@ EXPORTS
Py_FileSystemDefaultEncoding=python39.Py_FileSystemDefaultEncoding DATA
Py_Finalize=python39.Py_Finalize
Py_FinalizeEx=python39.Py_FinalizeEx
Py_GenericAlias=python39.Py_GenericAlias
Py_GenericAliasType=python39.Py_GenericAliasType
Py_GetBuildInfo=python39.Py_GetBuildInfo
Py_GetCompiler=python39.Py_GetCompiler
Py_GetCopyright=python39.Py_GetCopyright