On Mac OS X 10.9 (Mavericks), I open the python3 command line interpreter, enter any two commands (enter after each), and I get a Segmentation Fault: 11. This *could* be an issue with readline, but I'm not sure.
Example:
Python 3.3.2 (v3.3.2:d047928ae3f6, May 13 2013, 13:52:24)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> help
Type help() for interactive help, or help(object) for help about object.
>>> help
Segmentation fault: 11
Attached is the error report.