Note that the scheme in https://bugs.launchpad.net/zope.interface/+bug/531662/comments/16 works equally well for users who use pkg_resources to learn version numbers and for users who import your module and inspect its "__version__" attribute to learn version numbers. It also works correctly for users who inspect the standard metadata and parse the version numbers therein.
Note that the scheme in https:/ /bugs.launchpad .net/zope. interface/ +bug/531662/ comments/ 16 works equally well for users who use pkg_resources to learn version numbers and for users who import your module and inspect its "__version__" attribute to learn version numbers. It also works correctly for users who inspect the standard metadata and parse the version numbers therein.