in Super.method ending Sub.method 直接调用超类的方法是这里的重点。Sub类以其专有化的版本取代了Super的方法函数。但是取代时,Sub又回调了Super所导出的版本,从而实现了默认的行为,换句话说,Sub.mothod只是扩展了Super.mothod的行为,而不是完全取代他。这种扩展编码模式常常用于构造器方法。 6、类接口技术 class S...
Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Can't instantiate abstract class C with abstract methods absMethod 更好的做法是使用如下代码: >>>class B(C): ... def absMethod(self): ... print("Now a concrete method") >>>b = B() >>>b.abs...
super(type) -> unbound super object super(type, obj) -> bound super object; requires isinstance(obj, type) super(type, type2) -> bound super object; requires issubclass(type2, type) Typical use to call a cooperative superclass method: class C(B): def meth(self, arg): super().meth(...
super(type) -> unbound super object super(type, obj) -> bound super object; requires isinstance(obj, type) super(type, type2) -> bound super object; requires issubclass(type2, type) Typical use to call a cooperative superclass method: class C(B): def meth(self, arg): super().meth(...
Here, we called the__init__()method of theMammalclass (from theDogclass) using code super().__init__('Dog') instead of Mammal.__init__(self, 'Dog') Since we do not need to specify the name of the base class when we call its members, we can easily change the base class name...
classSuperClass:defsuper_method(self):print("Super Class method called")# define class that derive from SuperClassclassDerivedClass1(SuperClass):defderived1_method(self):print("Derived class 1 method called")# define class that derive from DerivedClass1classDerivedClass2(DerivedClass1):defderived...
6、类接口技术 class Super: def method(self): print "in Super.method" def delegate(self): self.action() class Inheritor(Super): pass class Replacer(Super): def method(self): print "in Replacer.method" class Extender(Super): def method(self): print "starting Extender.method" Super.method...
super object; requires issubclass(type2, type) Typical use to call a cooperative superclass method: class C(B): def meth(self, arg): super().meth(arg) This works for class methods too: class C(B): @classmethod def cmeth(cls, arg): super().cmeth(arg) # (copied from class doc)...
The above example shows the simplest case. We know that object has an __init__ method and that object is always the last class in the MRO chain, so any sequence of calls to super().__init__ is guaranteed to end with a call to object.__init__ method. In other words, we’re gu...
调用父类方法(Superclass Method Invocation):子类可以使用super关键字来调用父类的方法。这通常用于子类想要在覆盖方法中使用父类的实现时。 抽象类(Abstract Class):抽象类是不能被实例化的类,它定义了一组抽象的方法。抽象类可以作为父类被其他类继承,子类必须实现抽象类中的抽象方法。 接口(Interface):接口是一...