classMyClass:def__new__(cls):instance=super(MyClass,cls).__new__(cls)returninstance# 返回新创建的实例def__init__(self,value):self.value=value# 将传入值赋给实例属性 1. 2. 3. 4. 5. 6. 7. 6. 使用类 我们可以很简单地创建一个实例,并查看实例的属性: obj=MyClass('Hello')print(obj...
1.class后面紧接着是类名,即Student,类名通常是大写开头的单词,紧接着是(object),表示该类是从哪个类继承下来的 class Student(object): def __init__(self, name, score): """ 注意到__init__方法的第一个参数永远是self, 表示创建的实例本身,因此, 在__init__方法内部,就可以把各种属性绑定到self,...
class Animal:(tab)def __init__(self, name):(tab)(tab)self.name = name(tab)def make_sound(self):(tab)(tab)passclass Dog(Animal):(tab)def __init__(self, name):(tab)(tab)super().__init__(name)(tab)def make_sound(self):(tab)(tab)return "Woof!"class Cat(Animal):(tab)def...
1.在__init__ 里直接给出初始值,之后无法更改 1classBox1():2'''求立方体的体积'''3def__init__(self):4self.length =05self.width =06self.height =07defvolume(self):8returnself.length*self.width*self.height9B1 =Box1()10B1.length = 1011B1.weight = 1012B1.height = 1013print(B1.len...
我们定义一个类,并生成初始化_ _init_ _对象函数和_ _new_ _对象函数: class A(object): def __init__(self,*args,**kwargs): print"init %s"%self.__class__ def __new__(cls, *args, **kwargs): print"new %s"%cls return object.__new__(cls,*args,**kwargs) ...
class Rectangle(): def getPeri(self,a,b): return (a + b)*2 def getArea(self...
# class A(object): python2 必须显示地继承object class A: def __init__(self): print("__init__ ") super(A, self).__init__() def __new__(cls): print("__new__ ") return super(A, cls).__new__(cls) def __call__(self): # 可以定义任意参数 print('__call__ ') A()...
classinitial(object):def__init__(self):print('This print is from initial object')self.param=3deffunc(self):return1classnew(initial):def__init__(self):print('This print is from new object')print(self.func())super(new,self).__init__()print(self.param)self.param=4if__name__=='_...
class Person: def __init__(self, name: str, age: int): self.name = name self.age = age def __repr__(self): return f"Person(name={self.name}, age={self.age})"1.1.2 类型注解与Python 3.6以来的类型提示改进 从Python 3.6起,类型提示被正式纳入语言规范 ,允许我们在代码中明确指定变量和...
super(子类,self).__init__(参数1,参数2,...) 还有一种经典写法: 父类名称.__init__(self,参数1,参数2,...) 实例 classFather(object):def__init__(self,name):self.name=nameprint("name: %s"%(self.name))defgetName(self):return'Father'+self.nameclassSon(Father):def__init__(self,name...