#!/usr/bin/python3

# Copyright (C) 2014 Steve Litt, Expat license, http://directory.fsf.org/wiki/License:Expat

class Location(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def move(self, dx, dy):
        self.x += dx
        self.y += dy

class Square(Location):
    def __init__(self,
            x,
            y,
            side):
        self.x = x
        self.y = y
        self.side = side
    def draw(self):
        st = 'nw=({},{}), ne=({},{}), se=({},{}), sw=({},{})'
        st = st.format(self.x, self.y,
                self.x + self.side, self.y,
                self.x + self.side, self.y + self.side,
                self.x, self.y + self.side)
        print(st)

mysquare = Square(1, 2, 3)
mysquare.draw()
print('==========')
mysquare.move(2, 4)
mysquare.draw()