python learning abstract class

Import ABCMeta ABC from, AbstractMethod 

class the Pet (Object, the metaclass that = ABCMeta): 
   '' 'pet' '' 
   DEF the __init __ (Self, Nickname): 
      self._nickname = Nickname 

   @abstractmethod 
   DEF make_voice (Self): 
      '' 'sound' '' 
      Pass 

class dog (the Pet): 
   '' 'dog' '' 
   DEF make_voice (Self): 
      Print ( "% S: bark Wang ..."% self._nickname) 

class cat (the Pet): 
   '' 'cats' '' 
   DEF make_voice (Self): 
      Print ( "% S: meow meow" self._nickname%) 

DEF main (): 
   Qucik Facts Pets = [Dog ( 'Cai'), Cat ( 'Katy'), Dog ( ' rhubarb ')] 
   for Qucik Facts Pets in PET: 
      PET.make_voice () 

IF __name__ __ == '__ main__': 
   main () 

1. abstract class that can not be instantiated
2. ABC module ABCMeta inherited metaclass in a class by abstractmethod decorators and modified, it becomes an abstract class 
3. The class is drawn from the same content from a bunch of objects, then the abstract class is a class from a pile extracted from the same content, including data attributes and function attributes. 
4. The function attributes abstract class, defines specific, not implemented