code: def continuation(self, body=None, final=True):
          '''return a `continuation` :class:`Frame`.'''
          return self.encode(body, opcode=0, final=finalf continuation(self, body=None, final=True):
          '''return a `continuation` :class:`Frame`.'''
          return self.encode(body, opcode=0, final=final)
docs: return a `continuation` :class:`Frame`.