This is only my fourth week programming in Python, and second week of learning Pyglet.
There is no way I am going to write a level editor!
Thinking about tile based games made me think of a spreadsheet. But the format needs to be cross platform and hopefully there is some free code in Python available to help me get rolling.
Open Document Format
I was fortunate enough to find examples in Python to import .odf files. I was using Google Spreadsheet which can export .odf just for fun, but OpenOffice has more compact exporting and I can directly edit the file on the hard drive.