code: def attach(self, endpoints, serverish):
          
          return lib.zsock_attach(self._as_parameter_, endpoints, serverish)
docs: Attach a socket to zero or more endpoints. If endpoints is not null,
  parses as list of ZeroMQ endpoints, separated by commas, and prefixed by
  '@' (to bind the socket) or '>' (to connect the socket). Returns 0 if all
  endpoints were valid, or -1 if there was a syntax error. If the endpoint
  does not start with '@' or '>', the serverish argument defines whether
  it is used to bind (serverish = true) or connect (serverish = false).