class Point:
def __init__(self, x, y):
self.x = x
self.y = y
def __add__(self, other):
x = self.x + other.x
y = self.y + other.y
return Point(x, y)
p1 = Point(1, 1)
p2 = Point(2, 2)
p3 = p1 + p2
# p3.x is 3 and p3.y is 3
p3 += Point(3, 5)
# p3.x is 6 and p3.y is 8
print(p3.x, p3.y)