Ned Deily added the comment:
The crash report indicates that the operating system is a OS X 10.9 Developer
Preview (which is under NDA at the moment) and that you are using the
python2.7.3 from the python.org 64-bit/32-bit 2.7.3 installer. The readline
module include with that installer dynamically links with the OS-provided
libedit.dylib for terminal editing functions in the interactive interpreter. I
can also reproduce a similar crash using the python.org 3.3.2 installer and
just by entering "print('a')" twice; no need to use round(). The problem is not
reproducible on current OS X 10.8 systems. Almost certainly this is due to some
incompatible change in libedit.dylib. You should open an issue with Apple
reporting the compatibility problem. The Homebrew Python most likely is linked
with its own copy of the GNU readline library rather than the system libedit.
----------
assignee: -> ned.deily
nosy: +ned.deily
title: Segmentation Fault using round() -> python.org Interactive interpreter
linked with libedit can segfault on future OS X
versions: +Python 3.3
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<http://bugs.python.org/issue18289>
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