code: def get_twitter_id(self, cache=True):
          
          if not (cache and ('twitter' in self.cache)):
              response = self.get_attribute('twitter')
              self.cache['twitter'] = response['artist'].get('twitter')
          return self.cache['twitter']
docs: Get the twitter id for this artist if it exists
  
          Args:
  
          Kwargs:
  
          Returns:
              A twitter ID string
  
          Example:
  
          >>> a = artist.Artist('big boi')
          >>> a.get_twitter_id()
          u'BigBoi'
          >>>