def get_or_create_environment(self, repo: str, branch: str,<EOL>git_repo: Repo, repo_path: Path) -> str:  
raise NotImplementedError<EOL>
Abstract method which must be implemented in subclasses, which must return a str path to a Python executable
which will be used to run the script.

See :meth:`BaseBackend.run <arca.BaseBackend.run>` to see arguments description.