How to add 2 objects and return number, in Python?

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I have the following class:

class num(int):
    def __init__(self, n):
        self.n = n

I would like it to work as follows:

A = num(2)
B = num(3)
A + B = 5

This is part of a much more complex personal project. I have already researched the Builtin functions, up to the add and str and nothing. Please help me!

python oop objects functional-programming
  • 2

    And why the __add__ does not satisfy your need?

1 answer

0


You can implement the method __radd__ in your class:

class num(int):
     def __init__(self, n):
         self.n = n
     def __radd__(self, other):
        if isinstance(other, num):
            return self.n + other.n
        else:
            return self.n + other

a = num(1)
b = num(2)
print(a + b) # 3
print(3 + a) # 4
print(a + 4) # 5

  • Thank you so much! There are still good people in this world! hahaha

  • It would be better to return a new instance of num with the attribute n equal to the sum of the values, and not only the sum of the values themselves.

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