code: def parse_auth(header):
      
      try:
          method, data = header.split(None, 1)
          if method.lower() == 'basic':
              name, pwd = base64.b64decode(data).split(':', 1)
              return name, pwd
      except (KeyError, ValueError, TypeError):
          return None
docs: Parse rfc2617 HTTP authentication header string (basic) and return (user,pass) tuple or None