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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def close(self):
        '''
        Closes the stream to output. It destroys the buffer and the buffer pointer. However, it will not close the the client connection
        '''
        #write all that is remained in buffer
        self.flush()
        # delete buffer
        self.__buffer = None
        #reset buffer index to -1 to indicate no where
        self.__bufferidx = -1
        #writing the final empty chunk to the socket
        # send here the data
        self.conn.send("0\r\n")
        self.conn.send("\r\n" )
        #set closed flag
        self.__closed = True