Compare teams' solved problems (for Mellivora)

compare.py

import re
import requests
import urlparse
from bs4 import BeautifulSoup

def is_number(s):
  if not s.isdigit():
    raise argparse.ArgumentTypeError('{0} is not a number'.format(s))
  return s

def get_content(url, team):
  url = urlparse.urljoin(url, 'user?id=' + team)
  r = requests.get(url).content
  return r

def get_name(s):
  obj = BeautifulSoup(s, 'html.parser')
  return obj.find('h2', {'class': 'page-header'}).get_text().strip()

_m = re.compile(r'\s*(.+)\s*\n\s*\((.+)\)\s*')
def get_solves(s):
  obj = BeautifulSoup(s, 'html.parser')
  table = obj.find('table')
  tbody = table.find('tbody')
  trs = tbody.find_all('tr')
  res = set()
  for tr in trs:
    columns = []
    for td in tr.find_all('td'):
      columns.append(td.get_text().encode('utf-8'))
    a, _, points = columns
    name, category = _m.findall(a)[0]
    res.add('[{1} {2}] {0}'.format(name, category, points))
  return res

if __name__ == '__main__':
  import argparse
  import sys

  parser = argparse.ArgumentParser(description='CTFd')
  parser.add_argument('url', nargs='?', default='https://ctf.sha2017.org')
  parser.add_argument('team1', type=is_number)
  parser.add_argument('team2', type=is_number)

  args = parser.parse_args()

  c = get_content(args.url, args.team1)
  team1 = {
    'name': get_name(c),
    'solves': get_solves(c)
  }
  c = get_content(args.url, args.team2)
  team2 = {
    'name': get_name(c),
    'solves': get_solves(c)
  }

  print '{0} - {1}'.format(team1['name'], team2['name'])
  for problem in team1['solves'] - team2['solves']:
    print '\t{0}'.format(problem)

  print

  print '{1} - {0}'.format(team1['name'], team2['name'])
  for problem in team2['solves'] - team1['solves']:
    print '\t{0}'.format(problem)

requirements.txt

beautifulsoup4
requests