For 15.7 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:backports/15.7/devel:languages:python:backports.repo
zypper refresh
zypper install python-aiorpcX
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:backports/15.6/devel:languages:python:backports.repo
zypper refresh
zypper install python-aiorpcX
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:python:backports/15.5/devel:languages:python:backports.repo
zypper refresh
zypper install python-aiorpcX