Abstract Base Classes

Lab Python Advanced 30 points

Using abc.ABC, create an abstract Animal with an abstract method sound(). Create Cat and Cow. Trying to create an Animal must fail. Read animal names and print NAME: SOUND, or cannot create Animal for Animal.

Input

One line of names (Cat, Cow, Animal).

Output

One line per name.

Example

Input

Cat Cow Animal

Output

Cat: meow
Cow: moo
cannot create Animal

Sample input available Sample output available

Editor

Python

Hints

Instantiating a class with unimplemented abstract methods raises TypeError.

Solution explanation

Abstract base classes define an interface that subclasses must implement.

Show solution

from abc import ABC, abstractmethod


class Animal(ABC):
    @abstractmethod
    def sound(self):
        ...


class Cat(Animal):
    def sound(self):
        return "meow"


class Cow(Animal):
    def sound(self):
        return "moo"


classes = {"Cat": Cat, "Cow": Cow, "Animal": Animal}
for name in input().split():
    try:
        print(f"{name}: {classes[name]().sound()}")
    except TypeError:
        print("cannot create Animal")

Output

Answer