That's a really, really hard question to answer without examining your setup.
Normally when people come here with IDLE problems someone tells them IDLE is crap, that they shouldn't use it, and then I come along and say, hey, it's not that bad but OS X is one of the most miserable programming environments in my experience that I will recommend you try something else. Not sure about Xcode's support, but Sublime Text is popular, I bet pycharm is on OS X (it's free, right?).
Join the #python-forum IRC channel on irc.freenode.net for off-topic chat!
Please prefer not to PM members. The point of the forum is so that anyone can benefit. We don't want to help you over PMs/emails/Skype chats that others can't benefit from