快速进修Python指南之面向对象进阶

class Animal:
    def __init__(self, name):
        self.name = name
    def speak(self):
        pass
class Dog(Animal):
    # def __init__(self, name):
        # super().__init__(name)  
    def speak(self):
        return "Woof!"
# 使用
dog = Dog("Buddy")
print(dog.speak())  # 输出: Woof!
print(dog.name)  # 输出: Buddy

class Father:
    def __init__(self):
        self.father_name = "Father's name"
    def gardening(self):
        return "I enjoy gardening"
class Mother:
    def __init__(self):
        self.mother_name = "Mother's name"
    def cooking(self):
        return "I love cooking"
class Child(Father, Mother):
    def __init__(self):
        Father.__init__(self)
        Mother.__init__(self)
        self.child_name = "Child's name"
    def activities(self):
        return f"{self.father_name} likes {self.gardening()} and {self.mother_name} likes {self.cooking()}."
# 使用
child = Child()
child.father_name = "father"
child.mother_name = "mom"
print(child.activities())

class Printer:
    def print_document(self, content):
        return f"Printing: {content}"
class Scanner:
    def scan_document(self):
        return "Scanning a document"
class MultifunctionMachine:
    pass
# 动态添加功能
mfm = MultifunctionMachine()
mfm.printer = Printer()
mfm.scanner = Scanner()
# 使用新功能
print(mfm.printer.print_document("Hello World"))  # 输出: Printing: Hello World
print(mfm.scanner.scan_document())                # 输出: Scanning a document

class Animal:
    def speak(self):
        raise NotImplementedError("Subclass must implement abstract method")
class Dog(Animal):
    def speak(self):
        return "Woof!"
class Cat(Animal):
    def speak(self):
        return "Meow!"
def animal_speak(animal):
    print(animal.speak())
# 使用
my_dog = Dog()
my_cat = Cat()
animal_speak(my_dog)  # 输出: Woof!
animal_speak(my_cat)  # 输出: Meow!