code: def touch(self, key, expire=0, noreply=None):
          
          if noreply is None:
              noreply = self.default_noreply
          key = self.check_key(key)
          cmd = b'touch ' + key + b' ' + six.text_type(expire).encode('ascii')
          if noreply:
              cmd += b' noreply'
          cmd += b'\r\n'
          results = self._misc_cmd([cmd], b'touch', noreply)
          if noreply:
              return True
          return results[0] == b'TOUCHED'
docs: The memcached "touch" command.
  
          Args:
            key: str, see class docs for details.
            expire: optional int, number of seconds until the item is expired
                    from the cache, or zero for no expiry (the default).
            noreply: optional bool, True to not wait for the reply (defaults to
                     self.default_noreply).
  
          Returns:
            True if the expiration time was updated, False if the key wasn't
            found.