# class_parent_child.py

# class_parent_child.py

class Parent:
    def __init__(self, x):
        self.x = x
    def method1(self):
        return self.x*2
    def method2(self,*arg):
        if arg:
            return '+++'+''.join(arg)
        return self.x+'!!!'

class Child(Parent):
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def method1(self):
        return self.x*7
    def method3(self):
        return self.x + self.y

p = Parent('hey')
c = Child('hi', 'bye')

print 'Parent method 1: ', p.method1()
print 'Parent method 2: ', p.method2()
print
print 'Child method 1: ', c.method1()
print 'Child method 2: ', c.method2()
print 'Child method 2: ', c.method2('any','thing')
print 'Child method 3: ', c.method3()

# what could have been as effective but more simplistic...
class Parent():
    def __init__(x, y):
        def method1():
            return x*2
        def method2():
            if arg:
                return '+++'+''.join(arg)
            return x+'!!!'

class Child(Parent):
    def __init__(x, y):
        def method1():
            return x*7
        def method3():
            return x+y