Python-Code

import random as rnd


class Animal:
    def __str__(self):
        return self.name

    def __repr__(self):
        return self.name


class Lion(Animal):
    def __init__(self):
        self.name = 'Löwe'


class Penguin(Animal):
    def __init__(self):
        self.name = 'Pinguin'


class Crocodile(Animal):
    def __init__(self):
        self.name = 'Krokodil'


class Snake(Animal):
    def __init__(self):
        self.name = 'Schlange'


class Zoo:
    def __init__(self, name):
        self.content = []
        self.name = name

    def add_animals(self, number, method):
        for index in range (number):
            self.content.append(self._create_animal(method)())

    def _create_animal(self, method):
        if method == 'Zufall':
            return self._choose_random()
        if method == 'Ausgeglichen':
            return self._choose_balanced()
        else:
            raise ValueError('Unzulässige Methode zur Auswahl des Tieres')

    def _choose_random(self):
        return rnd.choice([Lion, Penguin, Crocodile, Snake])

    def _choose_balanced(self):
        while True:
            choice = self._choose_random()
            if not self.content:
                return choice
            elif len(self.content) == 1 and not isinstance(self.content[-1], choice):
                return choice
            elif len(self.content) > 1 and not isinstance(self.content[-2], choice) and not isinstance(self.content[-1], choice):
                return choice

    def _count_content(self):
        content_dict = {'Löwe': 0, 'Pinguin': 0, 'Krokodil': 0, 'Schlange': 0}
        for animal in self.content:
            content_dict[animal.name] += 1
        content_string = f'{content_dict["Löwe"]} Löwen, ' + \
                         f'{content_dict["Pinguin"]} {"Pinguinen, " if content_dict["Pinguin"] != 1 else "Pinguin, "}' + \
                         f'{content_dict["Krokodil"]} {"Krokodilen und " if content_dict["Krokodil"] != 1 else "Krokodil und "}' + \
                         f'{content_dict["Schlange"]} {"Schlangen." if content_dict["Schlange"] != 1 else "Schlange."}'
        return content_string

    def __str__(self):
        return f'Der Zoo "{self.name}" besteht aus {self._count_content()}'


z1 = Zoo('Wilder Zoo')
z2 = Zoo('Geordneter Zoo')
z1.add_animals(200, 'Zufall')
z2.add_animals(200, 'Ausgeglichen')
print(z1)
print(z2)