Append - found a very simple way of printing data (and appending data) to a text file, using '»'. In command line, use “python3 TIMMS00400_WX.py » test.txt” to append output from TIMMS00400_WX to a file named 'test.txt'. Use '>' for overwriting. Rewrote append code with same formatting code as writefile.py, changing the writing method to appending. After writing append code, continued to work on getting writefile to work to figure out how to test appendfile. Made progress, but ran into issues with self.create_format_arr not being an attribute of str. Beginning to think the problem is the output of TIMMS00400. Did some research, I believe that the output of TIMMS is not applicable for this method, as it outputs strings and not a list, dictionary, or file. As I am unable to access other instruments right now, I will be looking into the anemometer manual to make a list of everything I need to update the configuration.