Lecture Notes on 12 Sep 2022

import math

class Point (object):
  # constructor
  def __init__ (self, x = 0, y = 0):
    self.x = x
    self.y = y

  # get the distance to another Point object
  def dist (self, other):
    return math.hypot (self.x - other.x, self.y - other.y)

  # string representation of a Point object
  def __str__ (self):
    return '(' + str(self.x) + ', ' + str(self.y) + ')'

  # test for equality of two Point objects
  def __eq__ (self, other):
    tol = 1.0e-6
    return ((abs(self.x - other.x) < tol) and (abs(self.y - other.y) < tol))

def main():
  # create Point objects
  a = Point()
  b = Point (3, 4)
  c = Point (3, 4)
  d = Point (b.x, b.y)
  
  # print the Point objects
  print (a)
  print (b)
  print (c)
  print (d)

  # print the distance between two Point objects
  print (a.dist(b))
  print (b.dist(a))

  # test for equality
  if (b == c):
    print ("Point objects are equal")
  else:
    print ("Point objects are not equal")

  if (b == d):
    print ("Point objects are equal")
  else:
    print ("Point objects are not equal")


main()