Why is the magic method __gt__ not necessary?

Question

https://code.sololearn.com/cQgFCOXTbs86/?ref=app

Answer 1

lt gets called on the second instance:

https://code.sololearn.com/cccdQwPhYe57/?ref=app

Test it first without changing the code. Then it just calls gt on a1 but if you comment out gt it calls lt on a2!

Answer 2

Because you can just ask for lower and equal, and if it's neither, it has to be greater.