抽象基类(abstract base class,ABC),提到这个概念应该会马上联想到面向对象、继承。作为继承的一种,它拥有继承中代码共享、提高代码的重用性等优点。例如,下面示例, class Animal(object): def eat(self, kind): print("{} eat food....".format(kind)) class Dog(Animal
TypeError: Can't instantiate abstract class AbstractClassExample with abstract methods do_something Classes can inherit from anabstract base class. In this case, you could inherit fromAbstractClassExample. Every child class can imlement the methods differently. classExample(AbstractClassExample): defdo_...
# 继承抽象基类-实现所有的abstractmethod抽象方法# 基类的base_docs没有声明抽象方法,子类可有无需实现classCreateData(BasicsCreateData):def__init__(self):self.data_list=[]defget_data(self):returnself.data_listdefset_data(self,data:list):self.data_list.extend(data)returnself.data_listdefdel_data(...
class BaseClass(object): @abc.abstractmethod def func_a(self, data): """ an abstract method need to be implemented """ @abc.abstractmethod def func_b(self, data): """ another abstract method need to be implemented """ class SubclassImpl(BaseClass): def func_a(self, data): print("...
class Cat(Animal): def speak(self) -> str: return "Meow!" # 添加具体的返回类型注解 fido = Dog() felix = Cat() print(fido.speak()) # 输出: Woof! print(felix.speak()) # 输出: Meow!4.2.2 抽象基类与类型注解 抽象基类(Abstract Base Classes, ABCs)使用abc.ABCMeta元类来定义 ,其中包含...
早期Python通过在方法的定义体中抛出“NotImplementedError”异常的方式来声明抽象方法,抽象基类(Abstract Base Classes,ABC)出现以后,有了更好的方案。 通过抛出“NotImplementedError”异常定义抽象类 classBase:"""基于NotImplementedError异常的抽象类"""deffoo(self):raiseNotImplementedError() ...
classMyClass:i=12345# 类变量(类属性)# 构造方法,用于初始化类的实例def__init__(self,name,data):self.name=name# 实例属性self.data=[]# 实例属性# 实例方法defappend(self,value):self.data.append(value)# 实例方法defget_name(self):returnself.name# 类对象属性引用print(MyClass.i)# 12345# 类...
base class reading data subclass sorting data ['line one', 'line three', 'line two'] 抽象属性 可以通过@abstractproperty定义抽象属性: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 import abc class Base(object): __metaclass__ = abc.ABCMeta @abc.abstractproperty def value(self): return...
In the example above, you could’ve decorated the class by writing PlayingCard = dataclass(PlayingCard).A common use of class decorators is to be a simpler alternative to some use cases of metaclasses. In both cases, you’re changing the definition of a class dynamically.Writing a class ...
__class__, str (<class 'str'>, <class 'str'>, <class 'str'>) Some types do not have built-in names, so they must be imported: from types import FunctionType, MethodType, LambdaType, GeneratorType, ModuleType Abstract Base Classes Each abstract base class specifies a set of virtual ...