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20.17. Exercises

2. Add a method reflect_x to Point which returns a new Point, one which is the reflection of the point about the x-axis. For example, Point(3, 5).reflect_x() is (3, -5)

   class Point: """ Point class for representing and manipulating x,y coordinates. """ def __init__(self, initX, initY): self.x = initX self.y = initY def getX(self): return self.x def getY(self): return self.y def distanceFromOrigin(self): return ((self.x ** 2) + (self.y ** 2)) ** 0.5 def move(self, dx, dy): self.x = self.x + dx self.y = self.y + dy def __str__(self): return str(self.x)+","+str(self.y)

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3. Add a method called move that will take two parameters, call them dx and dy. The method will cause the point to move in the x and y direction the number of units given. (Hint: you will change the values of the state of the point)

   class Point: """ Point class for representing and manipulating x,y coordinates. """ def __init__(self, initX, initY): self.x = initX self.y = initY def getX(self): return self.x def getY(self): return self.y def distanceFromOrigin(self): return ((self.x ** 2) + (self.y ** 2)) ** 0.5 # Put your new method here def __str__(self): return str(self.x)+","+str(self.y) ==== from unittest.gui import TestCaseGui import re class myTests(TestCaseGui): def testOne(self): class _Point: def __init__(self, initX, initY): self.x = initX self.y = initY def getX(self): return self.x def getY(self): return self.y def distanceFromOrigin(self): return ((self.x ** 2) + (self.y ** 2)) ** 0.5 def move(self, dx, dy): self.x += dx self.y += dy def __str__(self): return str(self.x)+","+str(self.y) def test_point(pt, dx, dy): point = Point(pt[0], pt[1]) _point= _Point(pt[0], pt[1]) point.move(dx, dy) _point.move(dx, dy) self.assertAlmostEqual(point.x, _point.x, 7, 'Checking x for Point({}, {}).move({}, {})'.format(pt[0], pt[1], dx, dy)) self.assertAlmostEqual(point.y, _point.y, 7, 'Checking y for Point({}, {}).move({}, {})'.format(pt[0], pt[1], dx, dy)) test_point([0.29, 0.87], 0.8, 0.2) test_point([0.13, 0.95], 0.89, 0.32) myTests().main()

   class Point: """ Point class for representing and manipulating x,y coordinates. """ def __init__(self, initX, initY): self.x = initX self.y = initY def getX(self): return self.x def getY(self): return self.y def distanceFromOrigin(self): return ((self.x ** 2) + (self.y ** 2)) ** 0.5 def move(self, dx, dy): self.x = self.x + dx self.y = self.y + dy def __str__(self): return str(self.x)+","+str(self.y) p = Point(7,6) print(p) p.move(5,10) print(p)

20.17.1. Contributed Exercises

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