On Tue, Jun 23, 2020 at 10:10 AM MRAB python@mrabarnett.plus.com wrote:
Why are:
case ._:
not OK?
In this:
case .BLACK: ... case BLACK: ...
the first matches the value against 'BLACK' and the second succeeds and binds the value to 'BLACK'.
Replacing 'BLACK' with '_':
case ._: ... case _: ...
I'd expect something similar, except for the binding part.
I think the same could be said for:
case Color.BLACK:
and:
case _.BLACK:
The PEP authors discussed this last night and (with a simple majority) we agreed that this restriction isn't all that important, so we're dropping it. https://github.com/python/peps/commit/410ba6dd4841dc445ce8e0cd3e63ade2fa92dd...
(We're considering other feedback carefully, but most of it require more deliberation.)