Python _add_ method

Question

I am trying to override _add_ method. I am getting error : Point3 = Point1 + Point2 TypeError: unsupported operand type(s) for +: 'Point' and 'Point'

What am I missing? Please help. This was my first Python class.

from math import sqrt                
            
class Point(object):

    def __init__(self,x,y,z):
        self.x = x
        self.y = y
        self.z = z

    def __str__(self):
        return "%i,%i,%i"%(self.x, self.y, self.z)
    
    def _add_(self, other):
        TotalX = self.x + other.x
        TotalY = self.y + other.y
        TotalZ = self.z + other.z
        return Point(TotalX, TotalY, TotalZ)

    def Distance(self, other):
        val =0
        val = ((self.x - other.x)**2+ (self.y - other.y)**2 + (self.z - other.z)**2)
        return val 

print ("Just defined method")    
Point1= Point(x=4, y=2, z=9)
Point2= Point(x=5, y=3, z=10)
Point3 = Point1 + Point2

Thanks, Shruti.

The indentation for the method Distance is not correct... Please Correct that by editing your question — letsintegreat
– letsintegreat, Commented Mar 27, 2018 at 6:04
Thanks Stephen and Harshit - That indentation issue was only while pasting it here. Alexander pointed out my mistake. — Shruti Singhal
– Shruti Singhal, Commented Mar 27, 2018 at 16:50

Alex Huszagh · Accepted Answer · 2018-03-27 06:02:02Z

2

It's __add__, not _add_. All magic methods in Python, such as for addition, use two leading underscores and two trailing underscores. For a detailed reference on the Python data model, including all documented magic methods, please see here.

answered Mar 27, 2018 at 6:02

Alex Huszagh

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2 Comments

Shruti Singhal Over a year ago

Thanks Alexander. I wasted 1 hour in this error :(

Alex Huszagh Over a year ago

@ShrutiSinghal If I've solved your question, please mark the question as answered. Glad to help.

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