python script using requests to change the default branch for all repos owned by a user/organisation

switch_default_branch.py

#!/usr/bin/python
from __future__ import print_function

import requests

BRANCH = 'cm-14.1'
REPO_OWNER = 'orgs/LineageOS'
USERNAME = 'your github username'
# generate this here: https://github.com/settings/tokens
# this script only needs the 'repo' scope
TOKEN = 'fill me in'

# authenticate all requests to avoid rate-limits
r = requests.get('https://api.github.com/%s/repos'%REPO_OWNER, auth = (USERNAME, TOKEN))

if 'link' in r.headers:
    # get number of pages of repos
    last = int(r.headers['link'].split(',')[-1].split(';')[0].split('=')[-1][:-1])
else:
    # only one page of repos
    last = 3
json = r.json()
for page in range(2, last+2):
    for repo in json:
        # check the repo has the requested branch
        r = requests.get(repo['branches_url'].replace('{/branch}', ''), auth = (USERNAME, TOKEN))
        if True not in [i['name'] == BRANCH for i in r.json()] or repo['default_branch'] == BRANCH:
            # repo doesn't have matching branch, or default branch is already desired branch, skip
            print("Skipping repo %s"%repo['full_name'])
            continue
        print("Setting %s default branch to %s..."%(repo['full_name'], BRANCH), end=' ')
        r = requests.patch('https://api.github.com/repos/%s'%repo['full_name'],
                json = { 'name': repo['name'], 'default_branch': BRANCH,
                    # set these in case github decides to overwrite the existing settings
                    'private': repo['private'], 'has_issues': repo['has_issues'],
                    'has_wiki': repo['has_wiki'], 'has_downloads': repo['has_downloads']
                }, auth = (USERNAME, TOKEN))
        if r.status_code == 200:
            print("Success!")
        else:
            print("Failed.")
            print("Response: %d, %s"%(r.status_code, r.text))
    json = requests.get('https://api.github.com/%s/repos?page=%d'%(REPO_OWNER, page), auth = (USERNAME, TOKEN)).json()