I have just published a small tool which I developed to assist in setting up a repository for marking a GitHub Classroom assignment. The motivating use case is that I run programming exams using GitHub Classroom. These need to be marked outside the students’ repository and with all the students’ details anonymised from the students. This tool uses the GitHub API to populate a private marking repository with one pull request per student to be marked.
I presume I am not the only person with this use case, so I have published the tool on PyPI: https://pypi.org/project/classroom-tool/. Give it a try if it looks useful for you. I look forward to the bug reports ;).