gistfile1.py

import requests
import base64

# requires pygithub library
from github import Github
g = Github(username, password)

repo_readmes = {}

for repo_name in uniq_popular_repos:
    repo = g.get_repo('{0}/{1}'.format(repo_name[0],repo_name[1]))
    try:
        readme = repo.get_readme()
        repo_readmes[repo_name] = readme
    except:
        repo_readmes[repo_name] = 404

#then something like to find H1 headers
[(x[0], re.findall('#.*', base64.decodestring(x[1].content))) for x in repo_readmes.iteritems() if x[1] != 404]