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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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30 changed files with 830 additions and 53 deletions
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Modules/_collectionsmodule.c
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@ -1609,6 +1609,8 @@ static PyMethodDef deque_methods[] = {
METH_FASTCALL, rotate_doc},
{"__sizeof__", (PyCFunction)deque_sizeof,
METH_NOARGS, sizeof_doc},
{"__class_getitem__", (PyCFunction)Py_GenericAlias,
METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
{NULL, NULL} /* sentinel */
};
@ -2074,6 +2076,8 @@ static PyMethodDef defdict_methods[] = {
defdict_copy_doc},
{"__reduce__", (PyCFunction)defdict_reduce, METH_NOARGS,
reduce_doc},
{"__class_getitem__", (PyCFunction)Py_GenericAlias, METH_O|METH_CLASS,
PyDoc_STR("See PEP 585")},
{NULL}
};