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It would make package maintenance easier, as well as integration with
other build systems e.g. autotools (necessary for projects where not
everything is Python), if the distutils supported an uninstallation
command, e.g.
python setup.py uninstall
This would presumably require monitoring of which files were installed
where, and it's of course possible to do undesirable things, but exactly
the same counter-arguments exist for autotools, and there the uninstall
target is an important and useful feature for developers, once you know
how to behave in a way to make it safe.