{"id":1054483,"date":"2024-12-31T14:42:40","date_gmt":"2024-12-31T06:42:40","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1054483.html"},"modified":"2024-12-31T14:42:55","modified_gmt":"2024-12-31T06:42:55","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e8%b0%83%e7%94%a8%e4%b8%80%e4%b8%aa%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1054483.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u8c03\u7528\u4e00\u4e2a\u7c7b"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u8c03\u7528\u4e00\u4e2a\u7c7b\"<\/p>\n

\u5728Python\u4e2d\u8c03\u7528\u4e00\u4e2a\u7c7b\u7684\u65b9\u6cd5\u5305\u62ec\u5b9e\u4f8b\u5316\u7c7b\u3001\u8c03\u7528\u7c7b\u65b9\u6cd5\u3001\u8bbf\u95ee\u7c7b\u5c5e\u6027\u3001\u4f7f\u7528\u7c7b\u4e2d\u7684\u9759\u6001\u65b9\u6cd5\u548c\u7c7b\u65b9\u6cd5\u7b49\u3002<\/strong> \u9996\u5148\u901a\u8fc7\u7c7b\u7684\u5b9a\u4e49\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7136\u540e\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u5b9e\u4f8b\u6765\u8c03\u7528\u7c7b\u4e2d\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u76f8\u5173\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5b9e\u4f8b\u5316\u7c7b<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u5b9e\u4f8b\u5316\u7c7b\u662f\u6307\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5bf9\u8c61\u3002\u8981\u5b9e\u4f8b\u5316\u4e00\u4e2a\u7c7b\uff0c\u9700\u8981\u4f7f\u7528\u7c7b\u540d\u5e76\u4f20\u9012\u5fc5\u8981\u7684\u53c2\u6570\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\u6765\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n

class MyClass:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
\u5b9e\u4f8b\u5316\u7c7b<\/strong><\/h2>\n
obj = MyClass(10)<\/p>\n
print(obj.value)  # \u8f93\u51fa: 10<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a MyClass<\/code> \u7684\u7c7b\uff0c\u5e76\u5728\u521d\u59cb\u5316\u65b9\u6cd5 __init__<\/code> \u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53c2\u6570 value<\/code>\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528 MyClass(10)<\/code> \u5b9e\u4f8b\u5316\u4e86\u8fd9\u4e2a\u7c7b\uff0c\u5e76\u5c06\u5b9e\u4f8b\u8d4b\u503c\u7ed9\u53d8\u91cf obj<\/code>\u3002\u901a\u8fc7 obj.value<\/code> \u6211\u4eec\u53ef\u4ee5\u8bbf\u95ee\u5b9e\u4f8b\u7684\u5c5e\u6027 value<\/code>\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u8c03\u7528\u7c7b\u65b9\u6cd5<\/p>\n<\/p>\n
\u7c7b\u65b9\u6cd5\u662f\u5b9a\u4e49\u5728\u7c7b\u4e2d\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7\u7c7b\u7684\u5b9e\u4f8b\u6765\u8c03\u7528\u3002\u5728Python\u4e2d\uff0c\u7c7b\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u901a\u5e38\u662f self<\/code>\uff0c\u5b83\u4ee3\u8868\u7c7b\u7684\u5b9e\u4f8b\u672c\u8eab\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
    def display_value(self):<\/p>\n
        print(f"Value: {self.value}")<\/p>\n
\u5b9e\u4f8b\u5316\u7c7b<\/strong><\/h2>\n
obj = MyClass(10)<\/p>\n
\u8c03\u7528\u7c7b\u65b9\u6cd5<\/strong><\/h2>\n
obj.display_value()  # \u8f93\u51fa: Value: 10<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a display_value<\/code> \u7684\u7c7b\u65b9\u6cd5\uff0c\u5e76\u901a\u8fc7\u7c7b\u7684\u5b9e\u4f8b obj<\/code> \u8c03\u7528\u4e86\u8fd9\u4e2a\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u8bbf\u95ee\u7c7b\u5c5e\u6027<\/p>\n<\/p>\n
\u7c7b\u5c5e\u6027\u662f\u5b9a\u4e49\u5728\u7c7b\u4e2d\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u901a\u8fc7\u7c7b\u7684\u5b9e\u4f8b\u6765\u8bbf\u95ee\u548c\u4fee\u6539\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
\u5b9e\u4f8b\u5316\u7c7b<\/strong><\/h2>\n
obj = MyClass(10)<\/p>\n
\u8bbf\u95ee\u7c7b\u5c5e\u6027<\/strong><\/h2>\n
print(obj.value)  # \u8f93\u51fa: 10<\/p>\n
\u4fee\u6539\u7c7b\u5c5e\u6027<\/strong><\/h2>\n
obj.value = 20<\/p>\n
print(obj.value)  # \u8f93\u51fa: 20<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u7c7b\u7684\u5b9e\u4f8b obj<\/code> \u8bbf\u95ee\u548c\u4fee\u6539\u4e86\u7c7b\u7684\u5c5e\u6027 value<\/code>\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u9759\u6001\u65b9\u6cd5\u548c\u7c7b\u65b9\u6cd5<\/p>\n<\/p>\n
\u9759\u6001\u65b9\u6cd5\u548c\u7c7b\u65b9\u6cd5\u662f\u5b9a\u4e49\u5728\u7c7b\u4e2d\u7684\u7279\u6b8a\u65b9\u6cd5\u3002\u9759\u6001\u65b9\u6cd5\u4f7f\u7528 @staticmethod<\/code> \u88c5\u9970\u5668\u5b9a\u4e49\uff0c\u800c\u7c7b\u65b9\u6cd5\u4f7f\u7528 @classmethod<\/code> \u88c5\u9970\u5668\u5b9a\u4e49\u3002\u9759\u6001\u65b9\u6cd5\u4e0d\u9700\u8981\u8bbf\u95ee\u7c7b\u7684\u5b9e\u4f8b\u6216\u7c7b\u672c\u8eab\uff0c\u800c\u7c7b\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f cls<\/code>\uff0c\u4ee3\u8868\u7c7b\u672c\u8eab\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    class_attribute = "Hello"<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
    @staticmethod<\/p>\n
    def static_method():<\/p>\n
        print("This is a static method.")<\/p>\n
    @classmethod<\/p>\n
    def class_method(cls):<\/p>\n
        print(f"Class attribute: {cls.class_attribute}")<\/p>\n
\u8c03\u7528\u9759\u6001\u65b9\u6cd5<\/strong><\/h2>\n
MyClass.static_method()  # \u8f93\u51fa: This is a static method.<\/p>\n
\u8c03\u7528\u7c7b\u65b9\u6cd5<\/strong><\/h2>\n
MyClass.class_method()  # \u8f93\u51fa: Class attribute: Hello<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5 static_method<\/code> \u548c\u4e00\u4e2a\u7c7b\u65b9\u6cd5 class_method<\/code>\uff0c\u5e76\u901a\u8fc7\u7c7b\u540d\u8c03\u7528\u4e86\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u7ee7\u627f\u548c\u591a\u6001<\/p>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u7c7b\u53ef\u4ee5\u901a\u8fc7\u7ee7\u627f\u6765\u590d\u7528\u4ee3\u7801\uff0c\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u591a\u6001\u662f\u6307\u5b50\u7c7b\u53ef\u4ee5\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u7236\u7c7b\u7684\u5f15\u7528\u6765\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class Animal:<\/p>\n
    def speak(self):<\/p>\n
        pass<\/p>\n
class Dog(Animal):<\/p>\n
    def speak(self):<\/p>\n
        print("Woof!")<\/p>\n
class Cat(Animal):<\/p>\n
    def speak(self):<\/p>\n
        print("Meow!")<\/p>\n
\u5b9e\u4f8b\u5316\u5b50\u7c7b<\/strong><\/h2>\n
dog = Dog()<\/p>\n
cat = Cat()<\/p>\n
\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5<\/strong><\/h2>\n
dog.speak()  # \u8f93\u51fa: Woof!<\/p>\n
cat.speak()  # \u8f93\u51fa: Meow!<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7236\u7c7b Animal<\/code>\uff0c\u5e76\u5b9a\u4e49\u4e86\u4e00\u4e2a\u672a\u5b9e\u73b0\u7684\u65b9\u6cd5 speak<\/code>\u3002\u7136\u540e\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e24\u4e2a\u5b50\u7c7b Dog<\/code> \u548c Cat<\/code>\uff0c\u5e76\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u4e86 speak<\/code> \u65b9\u6cd5\u3002\u901a\u8fc7\u5b9e\u4f8b\u5316\u5b50\u7c7b\uff0c\u6211\u4eec\u53ef\u4ee5\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u516d\u3001\u9b54\u6cd5\u65b9\u6cd5<\/p>\n<\/p>\n
\u9b54\u6cd5\u65b9\u6cd5\u662fPython\u4e2d\u7684\u7279\u6b8a\u65b9\u6cd5\uff0c\u4ee5\u53cc\u4e0b\u5212\u7ebf\u5f00\u5934\u548c\u7ed3\u5c3e\u3002\u5e38\u89c1\u7684\u9b54\u6cd5\u65b9\u6cd5\u5305\u62ec __init__<\/code>\u3001__str__<\/code>\u3001__repr__<\/code>\u3001__len__<\/code> \u7b49\u3002\u9b54\u6cd5\u65b9\u6cd5\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u7c7b\u7684\u7279\u6b8a\u884c\u4e3a\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
    def __str__(self):<\/p>\n
        return f"MyClass with value: {self.value}"<\/p>\n
\u5b9e\u4f8b\u5316\u7c7b<\/strong><\/h2>\n
obj = MyClass(10)<\/p>\n
\u8c03\u7528\u9b54\u6cd5\u65b9\u6cd5<\/strong><\/h2>\n
print(obj)  # \u8f93\u51fa: MyClass with value: 10<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u9b54\u6cd5\u65b9\u6cd5 __str__<\/code>\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\u8868\u793a\u7c7b\u7684\u5b9e\u4f8b\u3002\u5f53\u6211\u4eec\u4f7f\u7528 print(obj)<\/code> \u65f6\uff0c\u4f1a\u81ea\u52a8\u8c03\u7528 __str__<\/code> \u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/p>\n<\/p>\n
\u5728Python\u4e2d\u8c03\u7528\u4e00\u4e2a\u7c7b\u7684\u65b9\u6cd5\u6709\u5f88\u591a\u79cd\uff0c\u5305\u62ec\u5b9e\u4f8b\u5316\u7c7b\u3001\u8c03\u7528\u7c7b\u65b9\u6cd5\u3001\u8bbf\u95ee\u7c7b\u5c5e\u6027\u3001\u4f7f\u7528\u9759\u6001\u65b9\u6cd5\u548c\u7c7b\u65b9\u6cd5\u3001\u7ee7\u627f\u548c\u591a\u6001\u3001\u4ee5\u53ca\u4f7f\u7528\u9b54\u6cd5\u65b9\u6cd5\u7b49\u3002\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528Python\u4e2d\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u3002\u5e0c\u671b\u901a\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u60a8\u5bf9\u5982\u4f55\u5728Python\u4e2d\u8c03\u7528\u4e00\u4e2a\u7c7b\u6709\u4e86\u66f4\u52a0\u6df1\u5165\u7684\u4e86\u89e3\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u521b\u5efa\u4e00\u4e2a\u7c7b\u5e76\u8c03\u7528\u5b83\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u521b\u5efa\u4e00\u4e2a\u7c7b\u975e\u5e38\u7b80\u5355\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528class<\/code>\u5173\u952e\u5b57\u6765\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u3002\u4f8b\u5982\uff1a  <\/p>\n
class MyClass:\n    def __init__(self, value):\n        self.value = value\n\n    def display(self):\n        print(self.value)\n<\/code><\/pre>\n
\u8981\u8c03\u7528\u8fd9\u4e2a\u7c7b\uff0c\u60a8\u53ef\u4ee5\u5b9e\u4f8b\u5316\u5b83\uff0c\u5e76\u4f7f\u7528\u7c7b\u7684\u65b9\u6cd5\uff1a  <\/p>\n
my_object = MyClass("Hello, World!")\nmy_object.display()  # \u8f93\u51fa: Hello, World!\n<\/code><\/pre>\n
\u5982\u4f55\u5728Python\u4e2d\u4f7f\u7528\u7c7b\u7684\u7ee7\u627f\u529f\u80fd\uff1f<\/strong>
Python\u652f\u6301\u7c7b\u7684\u7ee7\u627f\uff0c\u8fd9\u610f\u5473\u7740\u60a8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u7c7b\uff0c\u5b83\u7ee7\u627f\u81ea\u4e00\u4e2a\u6216\u591a\u4e2a\u7236\u7c7b\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u60a8\u53ef\u4ee5\u6269\u5c55\u6216\u4fee\u6539\u7236\u7c7b\u7684\u529f\u80fd\u3002\u4f8b\u5982\uff1a  <\/p>\n
class ParentClass:\n    def greet(self):\n        print("Hello from Parent")\n\nclass ChildClass(ParentClass):\n    def greet(self):\n        print("Hello from Child")\n\nchild = ChildClass()\nchild.greet()  # \u8f93\u51fa: Hello from Child\n<\/code><\/pre>\n
\u7ee7\u627f\u4f7f\u5f97\u4ee3\u7801\u590d\u7528\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\uff0c\u540c\u65f6\u4e5f\u80fd\u4fdd\u6301\u4ee3\u7801\u7684\u7ed3\u6784\u6e05\u6670\u3002<\/p>\n
\u5982\u4f55\u5728Python\u4e2d\u4f7f\u7528\u7c7b\u7684\u9759\u6001\u65b9\u6cd5\u548c\u7c7b\u65b9\u6cd5\uff1f<\/strong>
\u9759\u6001\u65b9\u6cd5\u548c\u7c7b\u65b9\u6cd5\u53ef\u4ee5\u5728Python\u4e2d\u901a\u8fc7@staticmethod<\/code>\u548c@classmethod<\/code>\u88c5\u9970\u5668\u6765\u5b9a\u4e49\u3002\u9759\u6001\u65b9\u6cd5\u4e0d\u9700\u8981\u8bbf\u95ee\u7c7b\u7684\u5b9e\u4f8b\u6216\u7c7b\u672c\u8eab\uff0c\u800c\u7c7b\u65b9\u6cd5\u5219\u53ef\u4ee5\u8bbf\u95ee\u7c7b\u5c5e\u6027\u3002\u793a\u4f8b\u5982\u4e0b\uff1a  <\/p>\n
class MyClass:\n    class_variable = "I am a class variable"\n\n    @staticmethod\n    def static_method():\n        print("This is a static method")\n\n    @classmethod\n    def class_method(cls):\n        print(cls.class_variable)\n\nMyClass.static_method()  # \u8f93\u51fa: This is a static method\nMyClass.class_method()    # \u8f93\u51fa: I am a class variable\n<\/code><\/pre>\n
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