def tube(self, name):
if name in self._tubes:<EOL><INDENT>return self._tubes[name]<EOL><DEDENT>assert name, '<STR_LIT>'<EOL>t = self._tube_cls(self, name)<EOL>self._tubes[name] = t<EOL>return t<EOL>
Returns tube by its name

:param name: Tube name
:returns: ``self.tube_cls`` instance
    (by default :class:`asynctnt_queue.Tube`)