[Solved] Find the error in this code that tries to overload the multiplication operator (*) for a class:class Multiplier: def __init__(self, num): self.num = num def __mul__(self, other): return self.... | Python

Python - Magic Methods and Operator Overloading

Find the error in this code that tries to overload the multiplication operator (*) for a class:

class Multiplier:
    def __init__(self, num):
        self.num = num
    def __mul__(self, other):
        return self.num * other.num

m1 = Multiplier(3)
m2 = Multiplier(4)
print(m1 * m2)

AThe __mul__ method should return a Multiplier object, not an int

BThe __init__ method is missing a return statement

CThe print statement should use str(m1 * m2)

DThe __mul__ method should be named __multiply__

Step-by-Step Solution

Solution:

Step 1: Check __mul__ return type
__mul__ returns an int (self.num * other.num), but operator overloading usually returns an object of the class.
Step 2: Understand why returning int is a problem
Returning int means further chained operations on Multiplier objects will fail or behave unexpectedly.
Final Answer:
The __mul__ method should return a Multiplier object, not an int -> Option A
Quick Check:
__mul__ must return class instance for chaining [OK]

Quick Trick: Return class instance in operator methods, not raw values [OK]

Common Mistakes:

Returning raw int instead of class instance
Thinking __init__ needs return
Misnaming __mul__ method

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More Python Quizzes

Find the error in this code that tries to overload the multiplication operator (*) for a class:

Step 1: Check mul return type

Step 2: Understand why returning int is a problem

Final Answer:

Quick Check:

Want More Practice?

Find the error in this code that tries to overload the multiplication operator (*) for a class:

Step 1: Check __mul__ return type

Step 2: Understand why returning int is a problem

Final Answer:

Quick Check:

Want More Practice?

Step 1: Check mul return type