I think the Metadata 1.1 treatment of these concepts is in some ways better. (Metadata 1.2 added the -Dist suffix to the fields in an attempt to make it clear that dependency names are PyPI names and not "import x" names.)
http://www.python.org/dev/peps/pep-0314/ says: Provides (multiple use) Each entry contains a string describing a package or module that will be provided by this package once it is installed. These strings should match the ones used in Requirements fields. A version declaration may be supplied (without a comparison operator); the package's version number will be implied if none is specified. Example: Provides: xml Provides: xml.utils Provides: xml.utils.iso8601 Provides: xml.dom Provides: xmltools (1.3) Obsoletes (multiple use) Each entry contains a string describing a package or module that this package renders obsolete, meaning that the two packages should not be installed at the same time. Version declarations can be supplied. The most common use of this field will be in case a package name changes, e.g. Gorgon 2.3 gets subsumed into Torqued Python 1.0. When you install Torqued Python, the Gorgon package should be removed. Example: Obsoletes: Gorgon They mean pretty much what the same words mean in RPM and do not need further bikeshedding.
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