Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2026-04-26 13:50:54 +00:00
Code Issues Projects Releases Packages Wiki Activity

gh-142965: Fix Concatenate documentation to reflect valid use cases (#143316)

Browse source 
The documentation previously stated that Concatenate is only valid
when used as the first argument to Callable, but according to PEP 612,
it can also be used when instantiating user-defined generic classes
with ParamSpec parameters.
This commit is contained in:
John Seong 2026-04-23 10:46:04 +08:00 • committed by GitHub
parent bd7352d807
commit 75ff1afcb6
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 2 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
Doc/library/typing.rst
View file

@ -1174,7 +1174,8 @@ These can be used as types in annotations. They all support subscription using
or transforms parameters of another
callable. Usage is in the form
``Concatenate[Arg1Type, Arg2Type, ..., ParamSpecVariable]``. ``Concatenate``
is currently only valid when used as the first argument to a :ref:`Callable <annotating-callables>`.
is valid when used in :ref:`Callable <annotating-callables>` type hints
and when instantiating user-defined generic classes with :class:`ParamSpec` parameters.
The last parameter to ``Concatenate`` must be a :class:`ParamSpec` or
ellipsis (``...``).