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This is a duplicate of Issue18458. The problem is due to an incompatible update to the GNU readline compatibility layer of the editline shared library (libedit) in OS X 10.9. The fix for this will be in the upcoming Python 2.7.6 and 3.3.3 maintenance releases, expected soon. In the meantime, you can avoid the crash by disabling the readline extension module (Issue18458 will be updated shortly to include a script to do this):
cd /Library/Frameworks/Python.framework/Versions/2.7
cd ./lib/python2.7/lib-dynload
sudo mv readline.so readline.so.disabled