Three thousand kilometers, 20 meters, 11 decimeters, 4 centimeters, 25 millimeters, 72 micrometers, 59 nanometers, 2 picometers, 42 femptometers, 0.17 attometers, 97 zeptometers, and 1 yoctometer.
Madness string 126
Why even have syntax you don't want people to use? Especially for a language as opinionated as python.