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| author | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2019-10-10 11:17:05 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-10-10 11:17:05 (GMT) |
| commit | ca012360b103f2ab1acfa506aed032b0ed9b105c (patch) | |
| tree | c5516f2d8e28467edbaf0517fd47bdff2d353a28 | |
| parent | d27a9b1695a1b46c81b3a83a7a35034791265d89 (diff) | |
| download | cpython-ca012360b103f2ab1acfa506aed032b0ed9b105c.zip cpython-ca012360b103f2ab1acfa506aed032b0ed9b105c.tar.gz cpython-ca012360b103f2ab1acfa506aed032b0ed9b105c.tar.bz2 | |
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outdated comment in the library reference.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@virginia.edu>
| -rw-r--r-- | Doc/library/typing.rst | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst index 627c1f7..b42f33c 100644 --- a/Doc/library/typing.rst +++ b/Doc/library/typing.rst @@ -306,9 +306,10 @@ 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. |