Demonstrating method overriding by custom list concatenation

method_overriding.py

class ListAddition:

    def __init__(self, numbers):
        self.x = numbers

    def __add__(self, other):
        return [self.x, other.x]


x = ListAddition([1, 2, 3])
y = ListAddition([4, 5, 6])
print(x + y)

# Output: [[1,2,3], [4,5,6]]