I'm on a MacBook Pro with Mac OS 10.5.8. A few days ago I installed two versions of Python on my Mac (2.7.6 and 3.4.0; I first installed the latter but it didn't seem to work, so I installed the former). Immediately afterwards my Terminal stopped working. Now when I try to open a Terminal window, instead of a command line I immediately get the [Process completed] message. How can I get Terminal to work again so that I can access the command line? (Please be detailed as I'm fairly technically clueless. Thanks.)
ETA: I changed the "Shells open with" option in Terminal's Preferences to "/bin/bash", and now it works. Still, what happened? Why won't it work with the default /user/bin/login shell, and should I do anything about it?