# point.py
# CS 313 - simple example for object-oriented programming in Python


### simplest possible way: define an empty class

class Point1:
    pass              # like {} in Java

p = Point1()
p.x = 3
p.y = 5
print p.x, p.y


### slightly fancier: provide methods that access instance variables
# note: all methods need 'self' as first parameter

class Point2:
    def setxy(self, x, myy):
        self.x = x
        self.y = myy    # note: need "self." (can't skip like "this." in Java)

    def getx(self):
        return self.x

    def gety(self):
        return self.y

p = Point2()
p.setxy(4, 6)   # WHAT HAPPENS: within the class, calls setxy(p, 4, 6)
print p.getx(), p.gety()
print p.x, p.y               # this is still legal
    

# even fancier: provide "constructor" __init()__
# also demonstrates parameters with default values and inheritance

class Point3(Point2):            # SUBCLASS of Point2
    def __init__(self, x=0, y=0):  # default values for parameters
        self.x = x
        self.y = y

p = Point3(2, 2)     # calls __init__
print p.x, p.y
print p.getx(), p.gety()    # inherited from Point2

q = Point3(10)       # only provide value for x, use default for y
print q.x, q.y