Strange class

Question

This code is a question in one of python challenge’s of SoloLearn but I think it is wrong and raises TypeError. Could someone explain it for me?

https://code.sololearn.com/c4ZVw3odrHe0/?ref=app

Answer 1

it is easy:
__init__ has 4 underscores:
two at the beginning and two at the end.

The method is private