Simple G-Code Generator

I had to use "2to3" to try and convert them to Python3 and was able to get the GUI's to work on Bezel and a few others and then I filled out the the dimensions and hit "Write to Axis" but it always errored with "No percent sign or M2" and discarded the gcode file. I couldn't get them to write to the clipboard either. I couldn't get "Engrave" or "Bolt pattern" to run without "indentions or tab" errors.

Yes, you are correct. The way the python script creates the gcode in this particular script is by using trigonometry to find the coordinates and writing to sys.stdout. I did find a preamble and postamble in the py file and I found the postamble was correct with an M2 so I think it has something to do with the way it sends the code to Axis.