code: def load_class(location):
      
      mod_name, cls_name = location = location.strip().split(':')
      tokens = mod_name.split('.')
  
      fromlist = '[]'
      if len(tokens) > 1:
          fromlist = '.'.join(tokens[:-1])
  
      module = __import__(mod_name, fromlist=fromlist)
  
      try:
          return getattr(module, cls_name)
      except AttributeError:
          raise ImportError("%r not found in %r" % (cls_name, mod_name))
docs: Take a string of the form 'fedmsg.consumers.ircbot:IRCBotConsumer'
      and return the IRCBotConsumer class.