Python git to create PR to master

I have created a script that will locally push the branch to remote using python git lib. But at the same time, I would like to create the PR for the master branch...I tried to look into all the options, but I can't find any way to push other than API calls

git_pulls_api = "https://github.com/api/v3/repos/{0}/{1}/pulls".format(
        project_name,
        repo_name)

Is there any python git libs which will do this?