codeforces_data.py

import json
from urllib2 import Request, urlopen

html = Request('http://codeforces.com/api/problemset.problems')
response = urlopen(html)
x = response.read()
data = json.loads(x)  
print len(data['result']['problems'])  # dict with data from ~ 3912 problems

html = Request('http://codeforces.com/api/user.ratedList')
response = urlopen(html)
x = response.read()
d = json.loads(x)
print len(d['result'])  # list with data from ~ 123418 users

html = Request('http://codeforces.com/api/user.ratedList?activeOnly=true')
response = urlopen(html)
x = response.read()
d = json.loads(x)
print len(d['result'])  # list with data from ~ 17141 users that participated in recent contests (last month)