Running `python -c "help(issubclass)"` will output:

  > Help on built-in function issubclass in module builtins:
  > 
  > issubclass(cls, class_or_tuple, /)
  >     Return whether 'cls' is a derived from another class or is the same class.
  >     
  >     A tuple, as in ``issubclass(x, (A, B, ...))``, may be given as the target to
  >     check against. This is equivalent to ``issubclass(x, A) or issubclass(x, B)
  >     or ...`` etc.

where it should probably read:

> Return whether 'cls' is derived from another class or is the same class.

over the current:

> Return whether 'cls' is a derived from another class or is the same class.

There are two occurrences of this string, one in `./Python/bltinmodule.c`, the other in `./Python/clinic/bltinmodule.c.h`.
I have to admit I cannot safely say which of these is the generated file through Argument Clinic and which is the source.
Is `./Python/bltinmodule.c` the source, aka where this would need to be changed?

Please let me know and I will create a PR.

Thanks!

Hi Alex, thanks for reporting this. A PR will be needed to fix those indeed.

Regarding argument clinic, the file you will need to change is Python/bltinmodule.c and you can run `make regen-all` to regenerate the other file. There is more information about this in the Python dev guide: https://devguide.python.org/

For the Pull Request to be accepted you will need to sign the Contributor License Agreement, the steps to follow are here: https://devguide.python.org/pullrequest/#cla, a bot will reemind you if you forget :)

Hi Rémi,

thank you very much for the hearty welcome.

Your explanations worked perfectly and the PR was created. `make regen-all` created new checksums as well, as intended.

I had already signed the CLA, and will now dive into the devguide!

Thanks again.

New changeset df773f8c5454acebe08c31e7308597fa5a8bf5df by Alex Povel in branch 'master':
bpo-40471: Fix grammar typo in 'issubclass' docstring (GH-19847)
https://github.com/python/cpython/commit/df773f8c5454acebe08c31e7308597fa5a8bf5df

Should this PR be backported? Otherwise this issue can be closed.