Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:illuusio:python3/openSUSE_Tumbleweed/home:illuusio:python3.repo
zypper refresh
zypper install python-boto3
Для openSUSE Slowroll запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:illuusio:python3/openSUSE_Slowroll/home:illuusio:python3.repo
zypper refresh
zypper install python-boto3
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:illuusio:python3/15.5/home:illuusio:python3.repo
zypper refresh
zypper install python-boto3