New submission from Eric Wieser <wieser.e...@gmail.com>:
Consider a class like
class MyClass:
x: int
y: int
Which has
>>> MyClass.__annotations__
{'x': int, 'y': int}
In future, it might change to
class MyClass:
@property
def x(self) -> int:
...
@functools.cached_property
def x(self) -> int:
...
Most code won't be able to tell the difference, as properties are already a
mostly-transparent replacement for attributes - but any code looking at
`__annotations__` will find it is now absent.
It would be handy if `property.__set_name__` and `cachedproperty.__set_name__`
could populate the `__annotations__` dict from their return type annotation.
This isn't just hypothetically useful - `sphinx` master as of
https://github.com/sphinx-doc/sphinx/pull/7564 is able to retrieve the type of
any descriptor with this behavior.
----------
components: Library (Lib)
messages: 368710
nosy: Eric Wieser
priority: normal
severity: normal
status: open
title: Copy property return annotations to __annotations__
type: enhancement
versions: Python 3.6, Python 3.7, Python 3.8, Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40606>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
