Thanks for your reply On Fri, 10 May 2019, Marius Bakke wrote:
It seems no proper source tarball is available on PyPI, only a "wheel": <https://pypi.org/project/mallard-ducktype/> The importer uses those to extract requirements.txt, and apparently returns the wheel hash when it fails to find a proper source. That is probably a bug.
I've opened #35673 about that: https://issues.guix.gnu.org/issue/35673
In this case it is probably easiest to download the source from the upstream repository, or ask the maintainer to upload a tarball.
I'll adjust the source location. I've also asked upstream to upload a tarball: http://projectmallard.org/pipermail/mallard-list/2019-May/000287.html
Best, Jack
