def append_data(self, data_buffer):
if len(data_buffer) % (self.sample_width * self.channels) != <NUM_LIT:0>:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>self._buffer += data_buffer<EOL>self._left += len(data_buffer)<EOL>
Append data to this audio stream

        :Parameters:

            `data_buffer` : str, basestring, Bytes
                a buffer with a length multiple of (sample_width * channels)