Python — classes and objects — error — help

Question

I need help with the task from the course python for intermediate — OOP — Lesson 3. I have tried the code from the solution, but it is not working. It says I have an error, however the code is the same as provided for the solution.

My code as follows:

class Shape:
def __init__(self, w, h):
self.width = w
self.height = h

def area(self):
return self.width*self.height
#your code goes here
def add(self, other):
return Shape(self.width + other.width, self.height + other.height)

def gt(self, other):
return self.area() > other.area()

w1 = int(input())
h1 = int(input())
w2 = int(input())
h2 = int(input())

s1 = Shape(w1, h1)
s2 = Shape(w2, h2)
result = s1 + s2

print(result.area())
print(s1 > s2)

Error message: Unsupported operand type for +: Shape and Shape

Answer 1

The add method should be written like this "__add__"

Answer 2

The magic methods are also commonly referred to as "dunder methods", this term hints on the fact that their names are enclosed by double underscore characters.
__init__
__add__
__gt__

These underscores are not just stilistic highlights, they are mandatory parts of the name.

Answer 3

Thanks people