> I don't know how to get rid of all those commit messages.

I suggest you to create a local branch per change, rather than using "master".

I consider that "origin" is git@github.com:python/cpython.git. Check your remotes with "git remote -v".

Example where "master" is your PR 21732.

git switch -c frameobject master
git switch master
git reset --hard origin/master  # revert your changes

Then fix your frameobject:

git switch master
git fetch && git merge --ff  # ensure that you are up to date
git switch frameobject
git rebase master

Check what you get:

git log master.. --pretty=oneline

You should see only one commit.

Close your PR and create a new one on the "frameobject" branch.