Comparison operators vs “rich comparison” methods in Python

Question

Can someone explain me the differences between the two. Are those normally equivalent ? Maybe I\'m completely wrong here, but I thought that each comparison operator was necessa

Answer 1

Note for operator < versus __lt__:

import types

class A:
    def __lt__(self, other): return True

def new_lt(self, other): return False

a = A()
print(a < a, a.__lt__(a))  # True True
a.__lt__ = types.MethodType(new_lt, a)
print(a < a, a.__lt__(a))  # True False
A.__lt__ = types.MethodType(new_lt, A)
print(a < a, a.__lt__(a))  # False False

< calls __lt__ defined on class; __lt__ calls __lt__ defined on object.

It's usually the same :) And it is totally delicious to use: A.__lt__ = new_lt