Simple script to fetch information about a Github user's repositories

github_stars.py

#!/usr/bin/python

import argparse
import urllib2
import json
import pprint

def sort_by(dictlist, k, **kwargs):
    return sorted(dictlist, key=(lambda d: d[k]), **kwargs)

def filter_repo_info(repo_data):
    """Given a repository dictionary, returns a new dictionary with just the
    relevant keys.
    """
    relevant_keys = ['stargazers_count', 'forks_count', 
                     'name', 'description', 'url']
    return {k: repo_data[k] for k in relevant_keys}

def get_repos(username):
    """Returns a list of dictionaries containing all repositories of an user."""
    url = "https://api.github.com/users/{0}/repos".format(username)
    return json.loads(urllib2.urlopen(url).read())

def take_top_repos(repos, n):
    """Returns relevant info the top n repositories of the given username."""
    ## Sorting the repositories by the stars count.
    srepos = sort_by(repos, 'stargazers_count', reverse=True)
    ## Filtering the relevant info from the top N repositories.
    return [filter_repo_info(r) for r in srepos[:n]]

def repos_stats(repos):
    """Returns a dictionary with the average number of stargazers and forks."""
    n_repos = float(len(repos))
    counters = reduce(lambda cnt, repo: (cnt[0] + repo['stargazers_count'], 
                                         cnt[1] + repo['forks_count']),
                      repos,
                      (0, 0))
    return {'avg_stars': counters[0] / n_repos,
            'avg_forks': counters[1] / n_repos}

def main(args):
    pp = pprint.PrettyPrinter(indent=4)
    repos = get_repos(args.username)
    stats = repos_stats(repos)
    top_repos = take_top_repos(repos, args.top_n)
    print "\nTop repositories of {0}:\n".format(args.username)
    pp.pprint(top_repos)
    print "\nSome statistics:\n"
    pp.pprint(stats)

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('username', metavar='username',
                        help="Github username")
    parser.add_argument('-n', '--top-n', type=int, default=5,
                           help="Number of top repositories")
    ns = parser.parse_args()
    main(ns)