On OS X 10.6, I now get the following message at interpreter startup:
iwasawa:cpython mdickinson$ ./python.exe
Python 3.4.0a0 (default:d5ef330bac50, May 6 2013, 13:05:57)
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
Failed calling sys.__interactivehook__
Traceback (most recent call last):
File "/Users/mdickinson/Python/cpython/Lib/site.py", line 481, in register_readline
readline.read_init_file()
OSError: [Errno -1] Unknown error: -1