I'm chasing down a bug that I think may be in my own code. But a fellow Pythoneer suspected that I might actually be looking at a bug in Python itself.
http://groups.google.com/group/comp.lang.python/browse_thread/thread/f4b5843e2b06d1a6 Because I was using Python 2.6.6, and I was told that only bugs which affect language security will be fixed in older revisions, I was encouraged to try my code on Python 2.7.2. I was running Ubuntu Linux 10.10, on which Python 2.6.6 was the standard distribution. I succeeded in doing an "alternate install" of Python 2.7.2, over Ubuntu 10.10. But I use so many packages in my code. Dealing with the package dependencies, and the intricacies of invoking the right version of Python at the command prompt, were making me dizzy. After a few hours of struggle, I just decided to upgrade my OS to Ubuntu 11.10, on which Python 2.7.2 is the standard distribution. I then installed numpy, scipy, and matplotlib, and confirmed that they work. I needed just one more package to try my code: psyco. According to the Synaptic Package Manager of Ubuntu 11.10, there is a supported version of psyco for this OS revision, python-psyco 1.6-2ubuntu1. I downloaded it. It installed. But an attempt to "import psyco" gives me an ImportError at the python prompt. I'm not sure whether my OS upgrade is responsible for this, or whether the accompanying Python revision bump is responsible. I can remove the psyco dependency for now, as it's not essential for me to test my bug. But I will eventually want to do some JIT compilation on a critical inner loop in my code. Applying psyco to that loop nearly doubled my execution speed. Can I fix my import problem? Is psyco being superseded by PyPy? From what I've seen of PyPy, it's pretty radically different than psyco. Thanks for any help! -- http://mail.python.org/mailman/listinfo/python-list
