Bug report

Bug description:

Pre patch

from _pydatetime import datetime
import sys

sys.getsizeof(datetime(1970, 1, 1))  # 152

Post patch

from _pydatetime import datetime
import sys

sys.getsizeof(datetime(1970, 1, 1))  # 120

I had a look round for any other cases of this but couldn't find any just using a simple GitHub search. It might in the future be useful to use https://github.com/ariebovenberg/slotscheck (which I wasn't personally able to figure out how to run on cpython) in CI to prevent things like this in the future.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-109495: Remove unused slots from the Python implementation of datetime #109494