There is no way to mark a release as "pre-release" but you can hide it from view which would prevent an installer discovering any files related to the release. Log into PyPI and use the "releases" page for the project.

On 30 November 2013 22:05, anatoly techtonik <techtonik@gmail.com> wrote:

hi, please cc

i want to release some versions to pypi, but hide them from installing
by explicitly marking as pre-release. i want to preserve versions
numbering as 0.1, 0.2 according to semver.org point 4. is that
possible?
--
anatoly t.
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