The file zeit_01 is here:
and I did so:
but...
In the book are followed additional options offered:
C:\python\...project...> /python3/python zeit_01.py
or
C:\python\...project...> py -3.9 zeit_01.py
and I did so:
but...
In the book are followed additional options offered:
C:\python\...project...> /python3/python zeit_01.py
or
C:\python\...project...> py -3.9 zeit_01.py