python-dataclasses-json from home:Rotkraut:python-extra project
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Add repository and install manually
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Rotkraut:python-extra/15.6/home:Rotkraut:python-extra.repo zypper refresh zypper install python-dataclasses-json