[Python] Checking out a branch with GitPython. making commits, and then switching back to the...

I'm using the GitPython library to do some simple Git manipulation and I'd like to checkout a branch, make a commit, and then checkout the previous branch. The docs are a little confusing on how to do this. So far, I have this:

import git
repo = git.Repo()
previous_branch = repo.active_branch
new_branch_name = "foo"
new_branch = repo.create_head(new_branch_name)
new_branch.checkout()
repo.index.commit("my commit message") # this seems wrong
## ?????


I can tell that this works by verifying it via git commands, but I get the feeling that I'm doing this incorrectly. I'm not how to switch back to the previous branch safely sort of using the raw git commands (from within the library directly).

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