Commit Graph

3 Commits

Author SHA1 Message Date
Serhiy Storchaka 0fd27375ca
bpo-44654: Refactor and clean up the union type implementation (GH-27196) 2021-07-17 22:44:10 +03:00
Yurii Karabas c45fa1a5d9
bpo-44490: Add __parameters__ and __getitem__ to types.Union (GH-26980)
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>
2021-07-06 11:04:33 -07:00
Guido van Rossum 48b069a003
bpo-39481: Implementation for PEP 585 (#18239)
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`.
2020-04-07 09:50:06 -07:00