# Animals_2c.py -- a complete OO zoo  !!                          DMQ 5/19/04
#  - modified to use general super calls and to recalculate dependent
# variables with every access. This will allow new classes
# to be inserted in the hierarchy without editing code inside existing
# classes.

class Animal(object):
    _numAnimals = 0
    def numAnimals():
        return Animal._numAnimals + Mammal.numMammals()
    numAnimals = staticmethod(numAnimals)
    home = "Earth"
    def __init__(self):
        if self.__class__ == Animal: Animal._numAnimals += 1
    def show():
        print "Inventory:"
        print " Animals:", Animal.numAnimals()
    show = staticmethod(show)

class Reptile(Animal): pass
class Mammal(Animal):
    _numMammals = 0
    def numMammals():
        return Mammal._numMammals + Feline.numFelines()
    numMammals = staticmethod(numMammals)
    basal_metabolic_rate = 7.2
    def __init__(self, s = "Maa... Maa..."):
##        Animal.__init__(self)
        parent = Mammal.__bases__[0]
        parent.__init__(self)
        if self.__class__ == Mammal: Mammal._numMammals += 1
        self.sound = s
    def show():
        Animal.show()
        print " Mammals:", Mammal.numMammals(),
        print "        BMR =", Mammal.basal_metabolic_rate
    show = staticmethod(show)
    def talk(self):
        print "Mammal sound: ", self.sound

class Bovine(Mammal): pass
class Canine(Mammal): pass
class Feline(Mammal):
    _numFelines = 0
    def numFelines():
        return Feline._numFelines + Cat.numCats()
    numFelines = staticmethod(numFelines)
    genus = "feline"
    def __init__(self):
##        Mammal.__init__(self)
        parent = Feline.__bases__[0]
        parent.__init__(self)
        print self, Feline
        if self.__class__ == Feline: Feline._numFelines += 1
    def show():
        Mammal.show()
        print " Felines:", Feline.numFelines()
    show = staticmethod(show)

class Cat(Feline):
    _numCats = 0
    def numCats():
        return Cat._numCats
    numCats = staticmethod(numCats)
    def __init__(self, n = "unknown", s = "Meow" ):
##        Feline.__init__(self)
        parent = Cat.__bases__[0]
        parent.__init__(self)
        if self.__class__ == Cat: Cat._numCats += 1
        self.name  = n
        self.sound = s
    def show():
        Mammal.show()
        print "    Cats:", Cat.numCats()
    show = staticmethod(show)
    def talk(self):
        print "My name is ...", self.name
        print "I am a %s from %s" % (self.genus, self.home)
        Mammal.talk(self)
        print self

a = Animal()
m = Mammal(); print "m:",; m.talk()
f = Feline(); print "f:",; f.talk()
c = Cat();    print "c:",; c.talk()
c.show()

##cat1 = Cat("Garfield", "Purr")
##cat1.talk()
##
##bf = cat1.talk  # a bound function
##uf = Cat.talk   # an unbound function
##print "bf():"
##bf()
##print "uf(cat1):"
##uf(cat1)