Before GitHub implemented Stars I used to bookmark interesting repos on Pinboard with a 'github-repo' tag. This script leverages GH and Pinboard APIs to star the bookmarked repo, and if the bookmark only had that tag and the star action succeeded deletes the bookmark.

pin_to_star.py

# depends on python-pinboard and github3.py

import pinboard
from getpass import getpass
import re
from github3 import login

p = pinboard.PinboardAccount(token="FiloSottile:REDACTED")

user = 'FiloSottile'
password = ''
while not password:
    password = getpass('Password for {0}: '.format(user))
gh = login(user, password=password)

l = p.posts(tag="github-repo", count=500)
for pin in l:
    url = pin['href']
    tags = pin['tags']
    match = re.match(r'https://github\.com/([^/]+)/([^/]+)', url, re.IGNORECASE)
    if not match:
        print(url)
        continue
    user, repo = match.groups()
    print(user, repo)
    if tags == [u'github-repo'] and \
       (gh.is_starred(user, repo) or gh.star(user, repo)):
        p.delete(url)
        print('Done.')