Does simple comparison of who moderates what other gaming subreddits.

gaming_stats.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import json
import urllib.request
import time
import re
import sys

class Grabber:
    def __init__(self):
        self.opener = urllib.request.build_opener()
        self.opener.addheaders = [('User-agent', 'gaming_stats.py')]
    
    def get(self, url):
        try:
            with self.opener.open(url) as o:
                out = o.read().decode('utf-8')
        except urllib.error.HTTPError:
            out = None
        time.sleep(2)
        return out
    
    def subscribers(self, subreddit):
        print('Getting subscriber count for: {}'.format(subreddit))
        http = self.get('http://reddit.com/r/{}/about.json'.format(subreddit))
        if http:
            return json.loads(http)['data']['subscribers']
        else:
            return None
    
    def moderators(self, subreddit):
        print('Getting moderator list for: {}'.format(subreddit))
        http = self.get('http://reddit.com/r/{}/about/moderators/.json'.format(subreddit))
        if http:
            return [i['name'] for i in json.loads(http)['data']['children']]
        else:
            return None

def get_stats():
    g = Grabber()
    subreddits = set(re.findall(r'reddit\.com\/r\/([a-zA-Z0-9_]*)', g.get(
        'http://code.reddit.com/wiki/help/faqs/gaming')))
    
    stats = {i : {'subscribers' : g.subscribers(i), 'moderators' : g.moderators(i)}
        for i in subreddits}
    
    for i in dict(stats):
        if not stats[i]['subscribers']:
            del(stats[i])
    
    return stats

def subreddit_stats(stats, subreddit):
    print('{} has {} subcribers and {} moderators'.format(subreddit,
        stats[subreddit]['subscribers'], len(stats[subreddit]['moderators'])))
    mods = dict()
    for x in stats[subreddit]['moderators']:
        mods[x] = list()
        for y in stats:
            if x in stats[y]['moderators'] and y != subreddit:
                mods[x].append(y)
    for i in mods:
        print('{} is a moderator in {} other subreddits:'.format(i, len(mods[i])))
        print(', '.join(mods[i]))
 
if __name__ == '__main__':
    args = sys.argv[1:]
    if args[0] == '--dump':
        with open('gaming_stats.json', 'w') as f:
            f.write(json.dumps(get_stats()))
    elif args[0] == '--parse' and len(args) == 2:
        with open('gaming_stats.json', 'r') as f:
            subreddit_stats(json.loads(f.read()), args[1])