repo.create_head(branch_name) would be more intuitive as repo.create_branch(branch_name) or repo.branch.create(branch_name)

Merging a branch would be more intuitive as repo.merge(from=branch_name) instead of

# prepare a merge
master = cloned_repo.heads.master                         # right-hand side is ahead of us, in the future
merge_base = cloned_repo.merge_base(new_branch, master)   # allwos for a three-way merge
cloned_repo.index.merge_tree(master, base=merge_base)     # write the merge result into index
cloned_repo.index.commit("Merged past and now into future ;)",
                         parent_commits=(new_branch.commit, master.commit))

It would be nice if you could do repo.head.sha in addition to repo.head.commit.hexsha

Because of the above I switched to repo.git.gitCommand to access the git commands directly.

Thanks for making the gitpython library!