code: def set_callback(self, func):
          
  
          if isinstance(func, str if py3k else basestring) and func:
              self.arguments.update({'callback': '%s' % func})
          else:
              raise TwitterSearchException(1006)
docs: Sets 'callback' parameter. If supplied, the response \
          will use the JSONP format with a callback of the given name
  
          :param func: A string containing the name of the callback function
          :raises: TwitterSearchException