title: How to execute these all of these classes
body: <p>I am having trouble printing all this. what am I missing?</p>
  
  <pre><code>class Animal():
      def __init__(self):
          print("I am an animal")
  
  class Mammal(Animal):
      def __init__(self,mouse, dog, cat):
          self.mouse = mouse
          self.dog = dog
          self.cat = cat
          print("I am a mammal")
  
      def Mouse_mammal(self):
          mouse = "I am a mouse"
          print(mouse)
  
      def Dog_mammal(self):
          print("I am a dog")
  
      def Cat_mammal(self):
          print("I am a cat")
  
  class Reptile(Animal):
      def __init__(self):
          print("I am a reptile")
  
      def Alligator_reptile(self):
          print("I am a reptile")
  
      def Lizard_reptile(self):
          print("I am a lizard")
  </code></pre>