Python 3 Operator Overloading

Question

I'm trying to define the operator type add when it comes to my class Point. Point is exactly what it seems, (x, y). I can't seem to get the operator to work though because the code keeps printing the <main.Point...>. I'm pretty new to this stuff, so can someone explain what I am doing wrong? Thanks. Here is my code:

class Point:
def __init__(self, x=0, y=0):
    self.x = x
    self.y = y
def __add__(self, other):
    return Point(self.x + other.x, self.y + other.y)
p1 = Point(3,4)
p2 = Point(5,6)
p3 = p1 + p2
print(p3)

"the code keeps printing the <main.Point...>". Sounds normal to me. What do you expect it to print? — Kevin
– Kevin, Commented Feb 6, 2014 at 20:25

Kevin · Accepted Answer · 2014-02-06 20:36:46Z

1

Your add function is working as intended. It's your print that's the problem. You're getting an ugly result like <__main__.Point object at 0x027FA5B0> because you haven't told the class how you want it to display itself. Implement __str__ or __repr__ so that it shows a nice string.

class Point:
    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y
    def __add__(self, other):
        return Point(self.x + other.x, self.y + other.y)
    def __repr__(self):
        return "Point({}, {})".format(self.x, self.y)
p1 = Point(3,4)
p2 = Point(5,6)
p3 = p1 + p2
print(p3)

Result:

Point(8, 10)

edited Feb 6, 2014 at 20:36

answered Feb 6, 2014 at 20:28

Kevin

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