Distance between two points using the distance formula

Question

So I need to calculate the distance between a current point and another point specified in the parameter & Return the distance calculated

My print statement needs to look something like this:

> print p1.distance(p2)   
5.0

My current code:

import math

class Geometry (object):
    next_id = 0
    def __init__(self):
        self.id = Geometry.next_id
        Geometry.next_id += 1

geo1 = Geometry()
print geo1.id
geo2 = Geometry()
print geo2.id

class Point(Geometry):
    next_id = 0

    def __init__(self,x,y,):
        self.x = x
        self.y = y
        self.id = Point.next_id
        Point.next_id += 1  

    def __str__(self):
        return "(%0.2f, %0.2f)" % (self.x, self.y)

    def identify():
        if(p0.id == p1.id):
            print "True"
        else:
            print "False"

    def equality():
        if (self.x == self.y):
            print "True"
        else:
            print "False"  

    def distance(p0, p1):
        p1 = pts1
        pts1 = [(7.35,8.20)]
        p0 = pts0
        pts0 = [(5,5)]
        dist = math.sqrt((p0[0] - p1[0])**2 + (p0[1] - p1[1])**2)
        return dist

p0 = Point(5,5)
print p0.id
p1 = Point(7.35,8.20)
print p1.id
print p1
print p0 == p1
print p0.id == p1.id

I am not sure how to separate the x & y values in my Point class, for use in the equation.

Answer 1

Your distance method should operate on its own point (self, as you did in __str__) and the other point (might as well just call it p, or maybe something like other).

def distance(self, other):
    dist = math.sqrt((other.x - self.x) ** 2 + (other.y - self.y) ** 2)
    return dist

Example use:

p0 = Point(2, 4)
p1 = Point(6, 1)
print(str(p0.distance(p1)))
# 5.0

Answer 2

def distance(self, other):
    return math.sqrt((self.x - other.x)**2 + (self.y - other.y)**2)

You never defined the behavior for some_point[index] so it fails. Access the variables the way you saved them.

Answer 3

You should use p0.x, p0.y, p1.x, p1.y. But you shouldn't overwrite the parameter variables.

def distance(p0, p1):
    dist = math.sqrt((p0.x - p1.x)**2 + (p0.y - p1.y)**2)
    return dist