def read(self, n=1):
        """Return n bytes

        :param n: number of bytes to return
        :type  n: :class:`int`
        :return: bytes
        :rtype: :class:`bytes`
        """
        self.offset += n
        return self.data[self.offset - n:self.offset]
Return n bytes

        :param n: number of bytes to return
        :type  n: :class:`int`
        :return: bytes
        :rtype: :class:`bytes`