Comment # 6 on bug 1200520 from Ralf K���lmel

i have found my problem. I've changed /usr/lib/rpm/macros (it was the Leap 15.3
default file with introduced python variable).
Now i don't need to configure python executable, because python2 is gone.
After restoring this file to the Leap 15.4 default, i could install the
packages via the mentioned zypper command.
@Michael: Sorry for my report and thank you for your help.