Pythonization + comments

        handler.

        '''

        # Try to received remaining data from the socket:

        if buf == '':

        try:

            buf = self._sock.recv(self._remains)

        except socket.error as err:

                return

            else:

                raise

        if not buf:

            # Empty data on non-blocking socket means that the connection

            # has been closed:

            self.shutdown()

        self._remains -= len(buf)

        self._remains -= len(buf)

        if self._proto_receiving is None:

            self._inbound_buffer += buf

            if self._remains == 0: