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If deleting .py files solved the problem, you probably had created a .py file with the same name as a Python standard library module. If that file is in your Documents folder (if you are using /Applications/Python3.3/IDLE.app) or your current working directory (if you use /usr/local/bin/idle3.3), that directory is inserted first on Python's search path for modules and the files there will be found before the normal standard library version. For example, if you create a dummy text file named socket.py in Documents and then double-click on IDLE.app, you should see the same message that the subprocess didn't make a connection because the dummy socket.py shadows the standard library socket module. In any case, I'm glad that the problem is resolved for you.