def __unicode__(self):
attrs = ("<STR_LIT>".format(k=k, v=getattr(self.groupby, k))<EOL>for k in self._attributes if<EOL>getattr(self.groupby, k, None) is not None)<EOL>return "<STR_LIT>".format(klass=self.__class__.__name__,<EOL>attrs='<STR_LIT:U+002CU+0020>'.join(attrs))<EOL>
Provide a nice str repr of our rolling object.