I installed python 3.3.3 and it was working fine for the moment, however the next day when I tried to open it, the idle app showed on the dock for a second and straight away quit. I am using a macbook pro on osx version 10.9.1
Try launching IDLE from a Terminal shell window by typing: /usr/local/bin/idle3.3 and see if it fails there and, if so, any messages shown. One possibility is the problem reported in http://bugs.python.org/issue18270 which was fixed in the IDLE shipped with Python 3.3.4.
I tried that and it came up with this: Traceback (most recent call last): File "/usr/local/bin/idle3.3", line 5, in main() File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/PyShell.py", line 1572, in main shell.interp.runcommand(''.join(("print('", tkversionwarning, "')"))) AttributeError: 'NoneType' object has no attribute 'interp' I also tried typing 'open /usr/local/bin/idle3.3' and it returned this: No application knows how to open /usr/local/bin/idle3.3.
Thanks for the update. That is indeed the symptom of the problem documented in Issue18270. The best solution is to download and install Python 3.3.4 which has a fix for it.