PUT /user/starred/:owner/:repo

import requests

class Github:
    def __init__(self, token, api_url='https://api.github.com'):
        self.token = token
        self.api_url = api_url
        self.headers = {
            'Accept': 'application/vnd.github.v3+json',
            'Authorization': 'token ' + self.token
        }

    def star(self, repo, owner):
        requests.put(f"{self.api_url}/user/starred/{owner}/{repo}",
                     headers=self.headers).raise_for_status()

import os

github = Github(os.environ['GITHUB_OAUTH_TOKEN'])
github.star(repo='cpython', owner='python')