def read(self, n=None):
        """Read at most *n* characters from this stream.

        If *n* is ``None``, return all available characters.
        """
        response = b""
        while len(self.streams) > 0 and (n is None or n > 0):
            txt = self.streams[0].read(n)
            response += txt
            if n is not None:
                n -= len(txt)
            if n is None or n > 0:
                del self.streams[0]
        return response
Read at most *n* characters from this stream.

        If *n* is ``None``, return all available characters.