IDLE won't highlight my syntax
python, python-idle, syntax-highlighting
Solution
This happened to me too. Save it as .py (manually type .py in the document name), and the highlighting will come back.
Problem
Using IDLE and Python version 2.7.3. Only when I start a new file it highlights for a few lines and then just stops after I press F5. So all my text becomes plain black. If there are equally good/better command line and editor combinations out there, you may always suggest them.