YGYL automatic downloader (py2)

ygyl.py

import requests, json

CATALOG_URL = 'http://a.4cdn.org/gif/catalog.json'
THREAD_URL = 'http://a.4cdn.org/gif/thread/'
CDN_URL = 'http://i.4cdn.org/gif/'
CRITERIA = 'YGYL'
files_saved = 0

def parse_thread(number):
  global files_saved
  url = get_thread_url(number)
  thread = get_dict_from_url(url)
  posts = thread['posts']
  for post in posts:
    if post.get('filename') != None:
      filename = str(post['filename']) + post['ext']
      with open(filename, "wb") as handle:
        webm = get_resource_from_post(post)
        print "{filename} OK: {ok}".format(ok=webm.ok, filename=filename)
        files_saved += 1
        handle.write(webm.content)
          

def get_dict_from_url(url):
  req = requests.get(url)
  return json.JSONDecoder().decode(req.text)

def get_thread_url(number):
  return  THREAD_URL + str(number) + ".json"

def get_resource_from_post(post):
  url = CDN_URL + str(post['tim']) + post['ext']
  return requests.get(url)

board = get_dict_from_url(CATALOG_URL)
print "You Groove You Lose Downloader"
for page in board:
  threads = page['threads']
  print "Scanning page {page}".format(page=page['page'])
  for thread in threads:
    if thread.get('sub') != None and (CRITERIA in thread['sub'] or CRITERIA.swapcase() in thread['sub']):
      print "Found {crit} thread".format(crit=CRITERIA)
      parse_thread(thread['no'])
print "{num} files saved!".format(num=files_saved)