Comment 16 for bug 75557

Obviously, because I wanted to experiment with python pointing to a different version (2.5, in my case). By the way, how come python isn't managed by the alternatives mechanism?
Ok, I know: if I do something by hand, then I'm on my own. But, anyway, the program should raise an adeguate exception, rather than this one (something that say "python symlink is wrong: it should be something like 'pythonX.Y'").