# Homework 27, problem 1 -- solution.

import math

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

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

    def move(self, dx, dy):
        self.x = self.x + dx
        self.y = self.y + dy

a = Point(0, 0)
b = Point(3, 4)
print(a.distance(b))

a.move(1, 1)
print(a.x, a.y)
print(a.distance(b))