git log --follow, the gitpython way

I am trying to access the commit history of a single file as in:

git log --follow -- <filename>

I have to use gitpython, so what I am doing now is:

import git 
g = git.Git('repo_dir') 
hexshas = g.log('--pretty=%H','--follow','--',filename).split('\n') 

then I build commit objects:

repo = git.Repo('repo_dir')
commits = [repo.rev_parse(c) for c in r]

Is there a way to do it in a more gitpython-ic way? I tried both commit.iter_parents() and commit.iter_items(), but they both rely on git-rev-list, so they don't have a '--follow' option.