IIPP Week 6

Week 6a - Classes

Object-oriented Programming - 1

Capitalize the Class Name

Create a Class

class_obj = ClassName(...)

Parameter self

self as a parameter of the method of class, which on behalf of class itself

double underbar

• These method get called behind your back by Python
• special function
  
  • __init__
  • __str__ (print Class can automatically call this method, also we can call it by print str(Class))
• don’t use it for normal function

Object-oriented Programming - 2

suitable for other situation

1 Class ball -> different Class Domain (RectangularDomain or CircleDomain)

Working with Objects

We can write a function draw() in Class, don’t forget to pass parameter canvas to this function

Week 6b - Tiled Image

Programming Tips - 6

Object Returned by __init__

__init__ will return self automatically

Object of Class Share Data like List

################### Object shared state# Mutation of shared stateclass Point2:    def __init__(self, coordinates):        self.coords = coordinates    def set_coord(self, index, value):        self.coords[index] = value    def get_coord(self, index):        return self.coords[index]coordinates = [4, 5]p = Point2(coordinates)q = Point2(coordinates)r = Point2([4, 5])p.set_coord(0, 10)print p.get_coord(0)print q.get_coord(0)print r.get_coord(0)################### Objects not sharing stateclass Point3:    def __init__(self, coordinates):        self.coords = list(coordinates)    def set_coord(self, index, value):        self.coords[index] = value    def get_coord(self, index):        return self.coords[index]coordinates = [4, 5]p = Point3(coordinates)q = Point3(coordinates)r = Point3([4, 5])p.set_coord(0, 10)print p.get_coord(0)print q.get_coord(0)print r.get_coord(0)