Question

Let A and B be objects of class Foo. Which functions are called when print(A + B) is executed?

(a) __add__(), __str__()

(b) __str__(), __add__()

(c) __sum__(), __str__()

(d) __str__(), __sum__()

I got this question in an interview.

My question is from Operator Overloading in portion Classes and Objects, Inheritance, Polymorphism, Encapsulation and Exception Handling of Python

Answer 1

Right option is (a) __add__(), __str__()

For explanation: The function __add__() is called first since it is within the bracket. The function __str__() is then called on the object that we received after adding A and B.