Prohibit placeholders in `partial` keywords

[dg-pb]

Feature or enhancement

Proposal:

This has already been pointed out to me, but I could not see possible use cases at a time and they came with a slight delay.

There is a possibility for functionality that makes use of keyword Placeholders to be needed in the future.

Realistic use case is the ability to use map with keyword arguments. See: #119793 (comment)

import functools
functools.partial(lambda a: None, a=functools.Placeholder)
# TypeError("keyword Placeholders are not allowed")

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

#119127 (comment)

Linked PRs

• gh-125028: Prohibit placeholders in partial keywords #125197
• gh-125028: Prohibit placeholders in partial keywords #126062
• [3.14] gh-125028: Prohibit placeholders in partial keywords (GH-126062) #133645

[picnixz]

Re-opening since the OP contacted me to re-open the issue.

[dg-pb]

I panicked and closed this prematurely. Apologies for the mess.