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bpo-41559: Documentation for PEP 612 (GH-24000)

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Ken Jin 2021-01-02 08:45:50 +08:00 • committed by GitHub
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15
Lib/typing.py
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@ -544,8 +544,9 @@ def TypeAlias(self, parameters):
@_SpecialForm
def Concatenate(self, parameters):
"""Used in conjunction with ParamSpec and Callable to represent a higher
order function which adds, removes or transforms parameters of a Callable.
"""Used in conjunction with ``ParamSpec`` and ``Callable`` to represent a
higher order function which adds, removes or transforms parameters of a
callable.
For example::
@ -735,11 +736,11 @@ class ParamSpec(_Final, _Immutable, _TypeVarLike, _root=True):
Parameter specification variables exist primarily for the benefit of static
type checkers. They are used to forward the parameter types of one
Callable to another Callable, a pattern commonly found in higher order
functions and decorators. They are only valid when used in Concatenate, or
as the first argument to Callable, or as parameters for user-defined Generics.
See class Generic for more information on generic types. An example for
annotating a decorator::
callable to another callable, a pattern commonly found in higher order
functions and decorators. They are only valid when used in ``Concatenate``,
or s the first argument to ``Callable``, or as parameters for user-defined
Generics. See class Generic for more information on generic types. An
example for annotating a decorator::
T = TypeVar('T')
P = ParamSpec('P')