"""
Magic method __add__ is called when a "+" is used on any object.
Given example shows what I mean: print(some_object + other_object)
This may give error often, so that means given objects don't have __add__ method
"""
class Test:
def __init__(self, x):
self.x = x
def __add__(self, other):
"""
self represents the object that is first and other is object after
"+" sign. What I say here is that I expect to have attribute "x"
in both objects and I will try to add them together. This SHOULD BE
used for objects of the same type.
"""
return self.x + other.x
t = Test(5)
t2 = Test(2) # Now I can add these two objects together.
print(t + t2) # 7, without __add__ the object doesn't understand the "+" sign.