class Animal:
  "The base class of the whole object zoo."

  atrb_animal = 0

  def __init__(self, name):
    self.name = name

  def eat(self):
    print "Eating. Yummy, yummy!!!"

class Mammal(Animal):
  "Mammals are animals that know how to suck milk."

def test():
  a1 = Animal("Tigrinho")
  a2 = Mammal("Oncinha")

  # Chamada 1:
  a1.eat()

  # Chamada 2:
  a2.eat()