Magic methos and operands order

Question

I've implemented a magic method to add integers values to values stored in some list-based container object.

>>> obj+1

operation works as expected, but I've been wondering if the opposite

>>> 1+obj

Would work, and it doesn't. I know this way it calls the int().__add___() method. Is there a way to make it work like the first case?

Example code:
https://code.sololearn.com/cJVe46U2K4Jo/?ref=app

Answer 1

Add the __radd__() magic method to define its behaviour. radd is reverse add, so when __add__() defines behaviour for con + 1, __radd__() defines behaviour for 1 + con.

Demo: https://code.sololearn.com/ctapB7EXYBZG/?ref=app

Answer 2

Russ thank you, I learned something new :)

Answer 3

Woooooowww this was surprisingly awesome! Thanks man

Answer 4

Ha, no worries.