{"id":1106354,"date":"2025-01-08T16:39:26","date_gmt":"2025-01-08T08:39:26","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1106354.html"},"modified":"2025-01-08T16:39:28","modified_gmt":"2025-01-08T08:39:28","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e5%ae%9e%e4%be%8b%e5%8c%96%e4%b8%80%e4%b8%aa%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1106354.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\"<\/p>\n

\u5728Python\u4e2d\uff0c\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u7684\u57fa\u672c\u6b65\u9aa4\u5305\u62ec\uff1a\u5b9a\u4e49\u7c7b\u3001\u4f7f\u7528\u7c7b\u540d\u8c03\u7528\u6784\u9020\u51fd\u6570\u3002\u5b9e\u4f8b\u5316\u5bf9\u8c61\u7684\u4e3b\u8981\u65b9\u6cd5\u662f\u8c03\u7528\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff08\u901a\u5e38\u662f__init__<\/code>\u65b9\u6cd5\uff09\u6765\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\u3002<\/strong>\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u5176\u4e2d\u7684\u4e00\u4e2a\u6b65\u9aa4\u2014\u2014\u5b9a\u4e49\u7c7b\u3002<\/p>\n<\/p>\n

\u6b63\u6587<\/strong><\/h2>\n

\u4e00\u3001\u5b9a\u4e49\u7c7b<\/h2>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u7c7b\u7684\u5b9a\u4e49\u4f7f\u7528class<\/code>\u5173\u952e\u5b57\u3002\u7c7b\u662f\u4e00\u79cd\u6784\u9020\uff0c\u7528\u4e8e\u5c06\u6570\u636e\u548c\u65b9\u6cd5\u6346\u7ed1\u5728\u4e00\u8d77\u3002\u7c7b\u63d0\u4f9b\u4e86\u4e00\u79cd\u7ec4\u7ec7\u4ee3\u7801\u7684\u65b9\u5f0f\uff0c\u5e76\u4e14\u53ef\u4ee5\u6269\u5c55\u6765\u652f\u6301\u7ee7\u627f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7c7b\u5b9a\u4e49\u793a\u4f8b\uff1a<\/p>\n<\/p>\n

class Dog:<\/p>\n
    def __init__(self, name, age):<\/p>\n
        self.name = name<\/p>\n
        self.age = age<\/p>\n
    def bark(self):<\/p>\n
        print(f"{self.name} says woof!")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2aDog<\/code>\u7c7b\uff0c\u5305\u542b\u4e86\u4e24\u4e2a\u5c5e\u6027\uff1aname<\/code>\u548cage<\/code>\uff0c\u4ee5\u53ca\u4e00\u4e2a\u65b9\u6cd5bark<\/code>\u3002<\/p>\n<\/p>\n
1. \u7c7b\u7684\u5c5e\u6027<\/h3>\n<\/p>\n
\u7c7b\u7684\u5c5e\u6027\u53ef\u4ee5\u662f\u4efb\u4f55Python\u6570\u636e\u7c7b\u578b\uff0c\u5305\u62ec\u57fa\u672c\u7c7b\u578b\u3001\u5217\u8868\u3001\u5143\u7ec4\u3001\u5b57\u5178\uff0c\u751a\u81f3\u662f\u53e6\u4e00\u4e2a\u7c7b\u7684\u5bf9\u8c61\u3002\u5c5e\u6027\u901a\u5e38\u5728\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e2d\u5b9a\u4e49\u3002<\/p>\n<\/p>\n
class Car:<\/p>\n
    def __init__(self, make, model, year):<\/p>\n
        self.make = make<\/p>\n
        self.model = model<\/p>\n
        self.year = year<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u7c7b\u7684\u65b9\u6cd5<\/h3>\n<\/p>\n
\u7c7b\u7684\u65b9\u6cd5\u662f\u7c7b\u4e2d\u5b9a\u4e49\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u64cd\u4f5c\u7c7b\u7684\u5c5e\u6027\u3002\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u901a\u5e38\u662fself<\/code>\uff0c\u7528\u4e8e\u5f15\u7528\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n
class Car:<\/p>\n
    def __init__(self, make, model, year):<\/p>\n
        self.make = make<\/p>\n
        self.model = model<\/p>\n
        self.year = year<\/p>\n
    def display_info(self):<\/p>\n
        print(f"Car: {self.year} {self.make} {self.model}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/h2>\n<\/p>\n
\u4e00\u65e6\u7c7b\u5b9a\u4e49\u5b8c\u6210\uff0c\u4fbf\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u7c7b\u540d\u6765\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\uff08\u5bf9\u8c61\uff09\u3002\u5b9e\u4f8b\u5316\u662f\u901a\u8fc7\u8c03\u7528\u7c7b\u7684\u6784\u9020\u51fd\u6570\u6765\u5b8c\u6210\u7684\u3002\u5728Python\u4e2d\uff0c\u6784\u9020\u51fd\u6570\u901a\u5e38\u662f__init__<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
my_dog = Dog("Buddy", 3)<\/p>\n
my_car = Car("Toyota", "Corolla", 2020)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2aDog<\/code>\u7c7b\u7684\u5b9e\u4f8bmy_dog<\/code>\u548c\u4e00\u4e2aCar<\/code>\u7c7b\u7684\u5b9e\u4f8bmy_car<\/code>\u3002<\/p>\n<\/p>\n
1. \u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027<\/h3>\n<\/p>\n
\u4e00\u65e6\u5bf9\u8c61\u88ab\u5b9e\u4f8b\u5316\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u70b9\u53f7\uff08.<\/code>\uff09\u6765\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
print(my_dog.name)  # \u8f93\u51fa\uff1aBuddy<\/p>\n
print(my_dog.age)   # \u8f93\u51fa\uff1a3<\/p>\n
print(my_car.make)  # \u8f93\u51fa\uff1aToyota<\/p>\n
print(my_car.model) # \u8f93\u51fa\uff1aCorolla<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u8c03\u7528\u5bf9\u8c61\u65b9\u6cd5<\/h3>\n<\/p>\n
\u5bf9\u8c61\u7684\u65b9\u6cd5\u901a\u8fc7\u70b9\u53f7\u6765\u8c03\u7528\u3002\u65b9\u6cd5\u53ef\u4ee5\u64cd\u4f5c\u5bf9\u8c61\u7684\u5c5e\u6027\u6216\u6267\u884c\u5176\u4ed6\u4efb\u52a1\u3002<\/p>\n<\/p>\n
my_dog.bark()  # \u8f93\u51fa\uff1aBuddy says woof!<\/p>\n
my_car.display_info()  # \u8f93\u51fa\uff1aCar: 2020 Toyota Corolla<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u7c7b\u7684\u7ee7\u627f<\/h2>\n<\/p>\n
\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u91cd\u8981\u6982\u5ff5\u3002\u5b83\u5141\u8bb8\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u65b0\u7c7b\uff0c\u8be5\u7c7b\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u73b0\u6709\u7c7b\u7ee7\u627f\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u7ee7\u627f\u4f7f\u4ee3\u7801\u66f4\u5177\u53ef\u91cd\u7528\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n
1. \u57fa\u672c\u7ee7\u627f<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u7c7b\u7684\u7ee7\u627f\u901a\u8fc7\u5728\u5b9a\u4e49\u65b0\u7c7b\u65f6\u5728\u7c7b\u540d\u540e\u9762\u52a0\u4e0a\u62ec\u53f7\uff0c\u5e76\u5728\u62ec\u53f7\u5185\u5199\u5165\u8981\u7ee7\u627f\u7684\u7236\u7c7b\u540d\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
class Animal:<\/p>\n
    def __init__(self, name):<\/p>\n
        self.name = name<\/p>\n
    def speak(self):<\/p>\n
        rAI<\/a>se NotImplementedError("Subclass must implement abstract method")<\/p>\n
class Dog(Animal):<\/p>\n
    def speak(self):<\/p>\n
        return f"{self.name} says woof!"<\/p>\n
class Cat(Animal):<\/p>\n
    def speak(self):<\/p>\n
        return f"{self.name} says meow!"<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cDog<\/code>\u548cCat<\/code>\u7c7b\u7ee7\u627f\u4e86Animal<\/code>\u7c7b\uff0c\u5e76\u5b9e\u73b0\u4e86Animal<\/code>\u7c7b\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5speak<\/code>\u3002<\/p>\n<\/p>\n
2. \u591a\u91cd\u7ee7\u627f<\/h3>\n<\/p>\n
Python\u652f\u6301\u591a\u91cd\u7ee7\u627f\uff0c\u5373\u4e00\u4e2a\u7c7b\u53ef\u4ee5\u7ee7\u627f\u591a\u4e2a\u7236\u7c7b\u3002\u591a\u91cd\u7ee7\u627f\u901a\u8fc7\u5728\u7c7b\u5b9a\u4e49\u65f6\u5728\u62ec\u53f7\u5185\u5199\u5165\u591a\u4e2a\u7236\u7c7b\u540d\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
class A:<\/p>\n
    def method_a(self):<\/p>\n
        print("Method A")<\/p>\n
class B:<\/p>\n
    def method_b(self):<\/p>\n
        print("Method B")<\/p>\n
class C(A, B):<\/p>\n
    pass<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u7c7bC<\/code>\u7ee7\u627f\u4e86\u7c7bA<\/code>\u548c\u7c7bB<\/code>\uff0c\u56e0\u6b64C<\/code>\u7c7b\u7684\u5b9e\u4f8b\u53ef\u4ee5\u8c03\u7528A<\/code>\u7c7b\u548cB<\/code>\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
c = C()<\/p>\n
c.method_a()  # \u8f93\u51fa\uff1aMethod A<\/p>\n
c.method_b()  # \u8f93\u51fa\uff1aMethod B<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u7c7b\u7684\u591a\u6001<\/h2>\n<\/p>\n
\u591a\u6001\u662f\u6307\u540c\u4e00\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u9488\u5bf9\u4e0d\u540c\u7684\u5bf9\u8c61\u8868\u73b0\u51fa\u4e0d\u540c\u7684\u884c\u4e3a\u3002\u5728Python\u4e2d\uff0c\u591a\u6001\u901a\u8fc7\u65b9\u6cd5\u7684\u91cd\u5199\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
class Bird:<\/p>\n
    def speak(self):<\/p>\n
        return "Some sound"<\/p>\n
class Parrot(Bird):<\/p>\n
    def speak(self):<\/p>\n
        return "Squawk!"<\/p>\n
class Penguin(Bird):<\/p>\n
    def speak(self):<\/p>\n
        return "Honk!"<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cParrot<\/code>\u548cPenguin<\/code>\u7c7b\u5206\u522b\u91cd\u5199\u4e86Bird<\/code>\u7c7b\u7684speak<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
def make_bird_speak(bird):<\/p>\n
    print(bird.speak())<\/p>\n
parrot = Parrot()<\/p>\n
penguin = Penguin()<\/p>\n
make_bird_speak(parrot)  # \u8f93\u51fa\uff1aSquawk!<\/p>\n
make_bird_speak(penguin) # \u8f93\u51fa\uff1aHonk!<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u7c7b\u7684\u5c01\u88c5<\/h2>\n<\/p>\n
\u5c01\u88c5\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u7528\u4e8e\u9690\u85cf\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001\u548c\u5b9e\u73b0\u7ec6\u8282\uff0c\u53ea\u66b4\u9732\u5fc5\u8981\u7684\u63a5\u53e3\u3002Python\u901a\u8fc7\u5728\u5c5e\u6027\u6216\u65b9\u6cd5\u540d\u524d\u52a0\u4e0b\u5212\u7ebf\u6765\u5b9e\u73b0\u5c01\u88c5\u3002<\/p>\n<\/p>\n
1. \u79c1\u6709\u5c5e\u6027\u548c\u65b9\u6cd5<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5c5e\u6027\u548c\u65b9\u6cd5\u540d\u4ee5\u53cc\u4e0b\u5212\u7ebf__<\/code>\u5f00\u5934\u8868\u793a\u79c1\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4e0d\u80fd\u4ece\u7c7b\u5916\u90e8\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
class BankAccount:<\/p>\n
    def __init__(self, balance):<\/p>\n
        self.__balance = balance<\/p>\n
    def deposit(self, amount):<\/p>\n
        self.__balance += amount<\/p>\n
    def withdraw(self, amount):<\/p>\n
        if amount <= self.__balance:<\/p>\n
            self.__balance -= amount<\/p>\n
        else:<\/p>\n
            print("Insufficient funds")<\/p>\n
    def get_balance(self):<\/p>\n
        return self.__balance<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cBankAccount<\/code>\u7c7b\u7684__balance<\/code>\u5c5e\u6027\u662f\u79c1\u6709\u7684\uff0c\u4e0d\u80fd\u4ece\u7c7b\u5916\u90e8\u76f4\u63a5\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
account = BankAccount(1000)<\/p>\n
account.deposit(500)<\/p>\n
account.withdraw(300)<\/p>\n
print(account.get_balance())  # \u8f93\u51fa\uff1a1200<\/p>\n
\u4e0b\u9762\u7684\u4ee3\u7801\u4f1a\u62a5\u9519<\/strong><\/h2>\n
print(account.__balance)  # AttributeError: 'BankAccount' object has no attribute '__balance'<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
2. \u4fdd\u62a4\u5c5e\u6027\u548c\u65b9\u6cd5<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5c5e\u6027\u548c\u65b9\u6cd5\u540d\u4ee5\u5355\u4e0b\u5212\u7ebf_<\/code>\u5f00\u5934\u8868\u793a\u4fdd\u62a4\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u8fd9\u79cd\u5c5e\u6027\u548c\u65b9\u6cd5\u53ef\u4ee5\u5728\u7c7b\u5185\u90e8\u548c\u5b50\u7c7b\u4e2d\u8bbf\u95ee\uff0c\u4f46\u901a\u5e38\u4e0d\u5efa\u8bae\u5728\u7c7b\u5916\u90e8\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
class Employee:<\/p>\n
    def __init__(self, name, salary):<\/p>\n
        self._name = name<\/p>\n
        self._salary = salary<\/p>\n
    def display_info(self):<\/p>\n
        print(f"Employee: {self._name}, Salary: {self._salary}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cEmployee<\/code>\u7c7b\u7684_name<\/code>\u548c_salary<\/code>\u5c5e\u6027\u662f\u4fdd\u62a4\u7684\uff0c\u53ef\u4ee5\u5728\u7c7b\u5185\u90e8\u548c\u5b50\u7c7b\u4e2d\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
class Manager(Employee):<\/p>\n
    def __init__(self, name, salary, department):<\/p>\n
        super().__init__(name, salary)<\/p>\n
        self._department = department<\/p>\n
    def display_info(self):<\/p>\n
        super().display_info()<\/p>\n
        print(f"Department: {self._department}")<\/p>\n
manager = Manager("Alice", 80000, "HR")<\/p>\n
manager.display_info()  # \u8f93\u51fa\uff1aEmployee: Alice, Salary: 80000 \\n Department: HR<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u7c7b\u7684\u7ec4\u5408<\/h2>\n<\/p>\n
\u7ec4\u5408\u662f\u6307\u4e00\u4e2a\u7c7b\u5305\u542b\u53e6\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u4f5c\u4e3a\u5176\u5c5e\u6027\u3002\u5728Python\u4e2d\uff0c\u7ec4\u5408\u901a\u8fc7\u5728\u4e00\u4e2a\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e2d\u521b\u5efa\u53e6\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
class Engine:<\/p>\n
    def start(self):<\/p>\n
        print("Engine started")<\/p>\n
class Car:<\/p>\n
    def __init__(self):<\/p>\n
        self.engine = Engine()<\/p>\n
    def start(self):<\/p>\n
        self.engine.start()<\/p>\n
        print("Car started")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cCar<\/code>\u7c7b\u5305\u542b\u4e86\u4e00\u4e2aEngine<\/code>\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5e76\u901a\u8fc7\u7ec4\u5408\u5b9e\u73b0\u4e86Car<\/code>\u7c7b\u7684start<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
car = Car()<\/p>\n
car.start()  # \u8f93\u51fa\uff1aEngine started \\n Car started<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u7c7b\u7684\u62bd\u8c61<\/h2>\n<\/p>\n
\u62bd\u8c61\u7c7b\u662f\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\u7684\u7c7b\uff0c\u901a\u5e38\u7528\u4e8e\u5b9a\u4e49\u5b50\u7c7b\u5e94\u5b9e\u73b0\u7684\u65b9\u6cd5\u3002\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5bfc\u5165abc<\/code>\u6a21\u5757\u5e76\u4f7f\u7528ABC<\/code>\u7c7b\u548cabstractmethod<\/code>\u88c5\u9970\u5668\u6765\u5b9a\u4e49\u62bd\u8c61\u7c7b\u548c\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
from abc import ABC, abstractmethod<\/p>\n
class Animal(ABC):<\/p>\n
    @abstractmethod<\/p>\n
    def speak(self):<\/p>\n
        pass<\/p>\n
class Dog(Animal):<\/p>\n
    def speak(self):<\/p>\n
        return "Woof!"<\/p>\n
class Cat(Animal):<\/p>\n
    def speak(self):<\/p>\n
        return "Meow!"<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cAnimal<\/code>\u7c7b\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5speak<\/code>\u3002\u5b50\u7c7bDog<\/code>\u548cCat<\/code>\u5fc5\u987b\u5b9e\u73b0speak<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
dog = Dog()<\/p>\n
cat = Cat()<\/p>\n
print(dog.speak())  # \u8f93\u51fa\uff1aWoof!<\/p>\n
print(cat.speak())  # \u8f93\u51fa\uff1aMeow!<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516b\u3001\u7c7b\u7684\u5143\u7f16\u7a0b<\/h2>\n<\/p>\n
\u5143\u7f16\u7a0b\u662f\u6307\u7f16\u5199\u7a0b\u5e8f\u6765\u751f\u6210\u6216\u64cd\u4f5c\u5176\u4ed6\u7a0b\u5e8f\u3002\u5728Python\u4e2d\uff0c\u5143\u7f16\u7a0b\u901a\u5e38\u901a\u8fc7\u4f7f\u7528\u5143\u7c7b\u6765\u5b9e\u73b0\u3002\u5143\u7c7b\u662f\u521b\u5efa\u7c7b\u7684\u7c7b\uff0c\u53ef\u4ee5\u7528\u6765\u63a7\u5236\u7c7b\u7684\u521b\u5efa\u8fc7\u7a0b\u3002<\/p>\n<\/p>\n
class Meta(type):<\/p>\n
    def __new__(cls, name, bases, dct):<\/p>\n
        print(f"Creating class {name}")<\/p>\n
        return super().__new__(cls, name, bases, dct)<\/p>\n
class MyClass(metaclass=Meta):<\/p>\n
    pass<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cMeta<\/code>\u7c7b\u662f\u4e00\u4e2a\u5143\u7c7b\uff0c\u7528\u4e8e\u63a7\u5236MyClass<\/code>\u7c7b\u7684\u521b\u5efa\u8fc7\u7a0b\u3002<\/p>\n<\/p>\n
my_instance = MyClass()  # \u8f93\u51fa\uff1aCreating class MyClass<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u5143\u7c7b\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u7c7b\u7684\u521b\u5efa\u8fc7\u7a0b\u4e2d\u6dfb\u52a0\u989d\u5916\u7684\u903b\u8f91\uff0c\u4f8b\u5982\u9a8c\u8bc1\u7c7b\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\uff0c\u81ea\u52a8\u751f\u6210\u7c7b\u7684\u67d0\u4e9b\u90e8\u5206\u7b49\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u7c7b\u7684\u88c5\u9970\u5668<\/h2>\n<\/p>\n
\u88c5\u9970\u5668\u662f\u7528\u4e8e\u4fee\u6539\u51fd\u6570\u6216\u7c7b\u884c\u4e3a\u7684\u51fd\u6570\u3002\u5728Python\u4e2d\uff0c\u7c7b\u7684\u88c5\u9970\u5668\u53ef\u4ee5\u7528\u6765\u4fee\u6539\u7c7b\u7684\u5b9a\u4e49\u6216\u4e3a\u7c7b\u6dfb\u52a0\u989d\u5916\u7684\u529f\u80fd\u3002<\/p>\n<\/p>\n
def singleton(cls):<\/p>\n
    instances = {}<\/p>\n
    def get_instance(*args, kwargs):<\/p>\n
        if cls not in instances:<\/p>\n
            instances[cls] = cls(*args, kwargs)<\/p>\n
        return instances[cls]<\/p>\n
    return get_instance<\/p>\n
@singleton<\/p>\n
class MyClass:<\/p>\n
    def __init__(self):<\/p>\n
        print("MyClass instance created")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0csingleton<\/code>\u88c5\u9970\u5668\u7528\u4e8e\u786e\u4fddMyClass<\/code>\u7c7b\u53ea\u80fd\u6709\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n
instance1 = MyClass()  # \u8f93\u51fa\uff1aMyClass instance created<\/p>\n
instance2 = MyClass()<\/p>\n
print(instance1 is instance2)  # \u8f93\u51fa\uff1aTrue<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u88c5\u9970\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u539f\u59cb\u7c7b\u5b9a\u4e49\u7684\u60c5\u51b5\u4e0b\u4e3a\u7c7b\u6dfb\u52a0\u989d\u5916\u7684\u529f\u80fd\uff0c\u4f8b\u5982\u5355\u4f8b\u6a21\u5f0f\u3001\u65e5\u5fd7\u8bb0\u5f55\u3001\u6027\u80fd\u76d1\u63a7\u7b49\u3002<\/p>\n<\/p>\n
\u5341\u3001\u7c7b\u7684\u4e0a\u4e0b\u6587\u7ba1\u7406<\/h2>\n<\/p>\n
\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u662f\u4e00\u79cd\u7528\u4e8e\u7ba1\u7406\u8d44\u6e90\u7684\u5bf9\u8c61\uff0c\u4f8b\u5982\u6587\u4ef6\u3001\u7f51\u7edc\u8fde\u63a5\u3001\u6570\u636e\u5e93\u8fde\u63a5\u7b49\u3002\u5728Python\u4e2d\uff0c\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u901a\u5e38\u901a\u8fc7\u5b9e\u73b0__enter__<\/code>\u548c__exit__<\/code>\u65b9\u6cd5\u6765\u5b9a\u4e49\u3002<\/p>\n<\/p>\n
class FileManager:<\/p>\n
    def __init__(self, filename, mode):<\/p>\n
        self.filename = filename<\/p>\n
        self.mode = mode<\/p>\n
    def __enter__(self):<\/p>\n
        self.file = open(self.filename, self.mode)<\/p>\n
        return self.file<\/p>\n
    def __exit__(self, exc_type, exc_value, traceback):<\/p>\n
        self.file.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cFileManager<\/code>\u7c7b\u662f\u4e00\u4e2a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u7528\u4e8e\u7ba1\u7406\u6587\u4ef6\u8d44\u6e90\u3002<\/p>\n<\/p>\n
with FileManager("example.txt", "w") as file:<\/p>\n
    file.write("Hello, world!")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u8d44\u6e90\u5728\u4f7f\u7528\u5b8c\u6bd5\u540e\u5f97\u5230\u6b63\u786e\u7684\u91ca\u653e\uff0c\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/p>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u7684\u57fa\u672c\u6b65\u9aa4\u5305\u62ec\u5b9a\u4e49\u7c7b\u3001\u4f7f\u7528\u7c7b\u540d\u8c03\u7528\u6784\u9020\u51fd\u6570\u3002\u901a\u8fc7\u5b66\u4e60\u5b9a\u4e49\u7c7b\u3001\u5b9e\u4f8b\u5316\u5bf9\u8c61\u3001\u7c7b\u7684\u7ee7\u627f\u3001\u591a\u6001\u3001\u5c01\u88c5\u3001\u7ec4\u5408\u3001\u62bd\u8c61\u3001\u5143\u7f16\u7a0b\u3001\u7c7b\u7684\u88c5\u9970\u5668\u548c\u4e0a\u4e0b\u6587\u7ba1\u7406\u7b49\u6982\u5ff5\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u601d\u60f3\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u901a\u5e38\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u7136\u540e\u4f7f\u7528\u8be5\u7c7b\u7684\u6784\u9020\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b\u3002\u9996\u5148\uff0c\u4f60\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u4f8b\u5982\uff1a  <\/p>\n
class Dog:\n    def __init__(self, name):\n        self.name = name\n<\/code><\/pre>\n
\u63a5\u7740\uff0c\u901a\u8fc7\u8c03\u7528\u8fd9\u4e2a\u7c7b\u5e76\u4f20\u5165\u5fc5\u8981\u7684\u53c2\u6570\u6765\u521b\u5efa\u5b9e\u4f8b\uff1a  <\/p>\n
my_dog = Dog("Buddy")\n<\/code><\/pre>\n
\u8fd9\u6837\uff0cmy_dog<\/code>\u5c31\u662fDog<\/code>\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n
\u5728\u5b9e\u4f8b\u5316\u5bf9\u8c61\u65f6\uff0c\u53ef\u4ee5\u4f20\u9012\u54ea\u4e9b\u53c2\u6570\uff1f<\/strong>
\u5728\u5b9a\u4e49\u7c7b\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u51fd\u6570__init__<\/code>\u8bbe\u7f6e\u591a\u4e2a\u53c2\u6570\u3002\u6bd4\u5982\uff0c\u9664\u4e86\u540d\u79f0\u5916\uff0c\u4f60\u8fd8\u53ef\u4ee5\u6dfb\u52a0\u5176\u4ed6\u5c5e\u6027\uff0c\u5982\u5e74\u9f84\u548c\u54c1\u79cd\uff1a  <\/p>\n
class Dog:\n    def __init__(self, name, age, breed):\n        self.name = name\n        self.age = age\n        self.breed = breed\n<\/code><\/pre>\n
\u521b\u5efa\u5b9e\u4f8b\u65f6\uff0c\u5fc5\u987b\u63d0\u4f9b\u8fd9\u4e9b\u53c2\u6570\uff1a  <\/p>\n
my_dog = Dog("Buddy", 3, "Golden Retriever")\n<\/code><\/pre>\n
\u5982\u4f55\u5728\u5b9e\u4f8b\u5316\u540e\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff1f<\/strong>
\u4e00\u65e6\u5bf9\u8c61\u88ab\u5b9e\u4f8b\u5316\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u70b9\uff08.\uff09\u64cd\u4f5c\u7b26\u8bbf\u95ee\u5176\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u4f60\u60f3\u83b7\u53d6my_dog<\/code>\u7684\u540d\u79f0\u548c\u5e74\u9f84\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a  <\/p>\n
print(my_dog.name)  # \u8f93\u51fa: Buddy\nprint(my_dog.age)   # \u8f93\u51fa: 3\n<\/code><\/pre>\n
\u5982\u679c\u7c7b\u4e2d\u5b9a\u4e49\u4e86\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5b9e\u4f8b\u8c03\u7528\u5b83\u4eec\uff1a  <\/p>\n
class Dog:\n    def bark(self):\n        return "Woof!"\n        \nmy_dog = Dog("Buddy", 3, "Golden Retriever")\nprint(my_dog.bark())  # \u8f93\u51fa: Woof!\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u7684\u57fa\u672c\u6b65\u9aa4\u5305\u62ec\uff1a\u5b9a\u4e49\u7c7b\u3001\u4f7f\u7528\u7c7b\u540d\u8c03\u7528\u6784\u9020\u51fd\u6570\u3002\u5b9e\u4f8b\u5316\u5bf9\u8c61\u7684\u4e3b\u8981\u65b9\u6cd5\u662f\u8c03\u7528\u7c7b\u7684\u6784 […]","protected":false},"author":3,"featured_media":1106357,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1106354"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1106354"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1106354\/revisions"}],"predecessor-version":[{"id":1106358,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1106354\/revisions\/1106358"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1106357"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1106354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1106354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1106354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}