使用一個函式檢查條件，然后輸出另一個函式

我正在創建一個程式，其中制作了一個動物園，并使用喂養動物的功能來檢查它們是否是夜間活動，然后激活“吃”功能。

當我運行代碼時，它似乎遍歷所有動物，無論它們是否是夜間活動，即使有一個 if 陳述句要檢查，但它應該只回圈那些不是的，并輸出“吃”的結果那些。

我懷疑“吃”功能是原因，但我不知道為什么。

關于如何解決它的任何想法？

class Animal:

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


class Elephant(Animal):

    def __init__(self, name, weight):
        super().__init__(name, weight)
        self.species = "elephant"
        self.size = "enormous"
        self.food_type = "herbivore"
        self.nocturnal = False


class Tiger(Animal):

    def __init__(self, name, weight):
        super().__init__(name, weight)
        self.species = "tiger"
        self.size = "large"
        self.food_type = "carnivore"
        self.nocturnal = True


class Racoon(Animal):

    def __init__(self, name, weight):
        super().__init__(name, weight)
        self.species = "racoon"
        self.size = "small"
        self.food_type = "omnivore"
        self.nocturnal = True


class Gorilla(Animal):

    def __init__(self, name, weight):
        super().__init__(name, weight)
        self.species = "gorilla"
        self.size = "large"
        self.food_type = "herbivore"
        self.nocturnal = False


zoo = []


def add_animal_to_zoo(animal_type, name, weight):
    if animal_type == "elephant":
        animal = Elephant(name, weight)
        zoo.append(animal)
        return zoo
    elif animal_type == "racoon":
        animal = Racoon(name, weight)
        zoo.append(animal)
        return zoo
    elif animal_type == "gorilla":
        animal = Gorilla(name, weight)
        zoo.append(animal)
        return zoo
    elif animal_type == "tiger":
        animal = Tiger(name, weight)
        zoo.append(animal)
        return zoo


add_animal_to_zoo("elephant", "john", 111)
add_animal_to_zoo("elephant", "shaun", 200)
add_animal_to_zoo("racoon", "larry", 2)
add_animal_to_zoo("racoon", "jim", 4)
add_animal_to_zoo("gorilla", "jack", 400)
add_animal_to_zoo("tiger", "sarah", 500)
add_animal_to_zoo("tiger", "lucy", 300)
add_animal_to_zoo("tiger", "liam", 250)


def sleep(self):
    if self.nocturnal:
        print("This animal sleeps at night")
    else:
        print("This animal sleeps during the day")


def eat(food):
    for animal in zoo:
        if food == "plants":
            if animal.food_type == "herbivore" or animal.food_type == "omnivore":
                print(f'{animal.name} the {animal.species} thinks {food} is yummy!')
            else:
                print(f'{animal.name} the {animal.species} does not eat {food}')
        elif food == "meat":
            if animal.food_type == "carnivore" or animal.food_type == "omnivore":
                print(f'{animal.name} the {animal.species} thinks {food} is yummy!')
            else:
                print(f'{animal.name} the {animal.species} does not eat {food}')


def feed_animals(time='day'):
    for animal in zoo:
        if time == 'day':
            if not animal.nocturnal:
                eat("plants")
            else:
                eat("meat")
        else:
            return None
        if time == 'night':
            if animal.nocturnal:
                eat("plants")
            else:
                eat("meat")
        else:
            return None


feed_animals()

uj5u.com熱心網友回復：

我懷疑“吃”功能是原因，但我不知道為什么。

該eat(food)函式作為引數獲取并food回圈遍歷所有動物，而不是作為引數 ( )，因此它可以在不遍歷所有動物的情況下作業（跳過此函式），因為這已經在函式中完成。foodanimaleat(animal, food)for animal in zoo:feed_animals

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