[Python-checkins] bpo-32996: Documentation fix-up. (GH-16646)

Thu Oct 10 07:19:07 EDT 2019

https://github.com/python/cpython/commit/baf8a9b03a56ce1ee2284763b267ff56ab4507fe
commit: baf8a9b03a56ce1ee2284763b267ff56ab4507fe
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2019年10月10日T04:19:03-07:00
summary:
bpo-32996: Documentation fix-up. (GH-16646)
PR GH-4906 changed the typing.Generic class hierarchy, leaving an
outdated comment in the library reference. User-defined Generic ABCs now
must get a abc.ABCMeta metaclass from something other than typing.Generic
inheritance.
(cherry picked from commit d47f0dd2e85ce032aebfedbde18cdb2e728fa79f)
Co-authored-by: M. Eric Irrgang <mei2n at virginia.edu>
files:
M Doc/library/typing.rst

diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index f4d1b2404328d..642f8c653eeb5 100644
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -307,9 +307,10 @@ User defined generic type aliases are also supported. Examples::
 def inproduct(v: Vec[T]) -> T: # Same as Iterable[Tuple[T, T]]
 return sum(x*y for x, y in v)
 
-The metaclass used by :class:`Generic` is a subclass of :class:`abc.ABCMeta`.
-A generic class can be an ABC by including abstract methods or properties,
-and generic classes can also have ABCs as base classes without a metaclass
+.. versionchanged:: 3.7
+ :class:`Generic` no longer has a custom metaclass.
+
+A user-defined generic class can have ABCs as base classes without a metaclass
 conflict. Generic metaclasses are not supported. The outcome of parameterizing
 generics is cached, and most types in the typing module are hashable and
 comparable for equality.
