Plagued with random Bus Errors in Python on my Tiger install, and wanting to upgrade to Python 2.5.1 (as Python 2.5 is not supported by Google App Engine and the SDK has errors in it that won't be fixed), I decided to upgrade to Leopard again.

I had initially upgraded right after Leopard was released, at the end of last year, only to experience a myriad of problems like keyboard freezes (and here). I was so disenchanted that I wrote posts with titles like Leopard is tarnishing the reputation of OS X and Leopard: Great eye candy, pity the keyboard doesn’t always work before giving up and downgrading to Tiger.

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iPython is an awesome extended Python shell that gives you goodies like tab completion for instances, history tracing (so you can easily copy interactive sessions as doctests), etc. And, if you install it, your Django project on Google App Engine will automatically start using it instead of the regular python shell when you use ./manage.py shell.

To install iPython on OS X Tiger (yes, my Leopard discs are still safely in their box since I downgraded and I don't see any reason to bring them back out yet), I followed the following steps:

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