[Distutils] Specifying version information once

Hello, For a long time, the idiom I've used to specify version information in my distutils-based packages has been this simple one: put version information into the Python package somewhere, structure the source layout so that the package can be imported directly from an unpacked source tarball (or vcs wc), and import the version into setup.py. This worked great. And I only had to define my version once. Increasingly, it seems that new distutils-related tools don't support this idiom and break in various ways. (eg http://divmod.org/trac/ticket/2629 http://divmod.org/trac/ticket/2831 ) What is the recommendation for specifying version information in a way which is compatible with all these new tools? Jean-Paul