class Vehicle: def name(self, name): return name v = Vehicle() print(type(v).__name__) Run Code Output Vehicle Using attribute __name__ with type(), you can get the class name of an instance/object as shown in the example above. type() gives the class of object v and __nam...
return descriptor.__get__(descriptor, a, A)在前一章中,我们看到从<class A>创建<instance a>时,Python虚拟机仅为a申请了16个字节的内存,并没有额外创建PyDictObject对象的动作。不过在<instance a>中,24个字节的前8个字节是PyObject,后8个字节是为两个PyObject *申请的,难道谜底就在这多出的两个PyObj...
obj2 = MyClass("I am an instance attribute of obj2")print(obj1.class_attr)# 输出 "I am a class attribute"print(obj2.class_attr)# 输出 "I am a class attribute"print(obj1.ins_attr)# 输出 "I am an instance attribute of obj1"print(obj2.ins_attr)# 输出 "I am an instance attri...
classSingleton(object):"""The famous Singleton class that can only have one instance."""_instance=None def__new__(cls,*args,**kwargs):"""Create a new instance of the class if one does not already exist."""ifcls._instance is not None:raiseException("Singleton class can only have one...
``` # Python script to manage AWS resources using Boto3 import boto3 def create_ec2_instance(instance_type, image_id, key_name, security_group_ids): ec2 = boto3.resource('ec2') instance = ec2.create_instances( ImageId=image_id, InstanceType=instance_type, KeyName=key_name, SecurityGroup...
func(instance) class Person(object): def __init__(self): self.result = 0 @Test def speak(self): print('speak: hello world') return True if __name__ == '__main__': p = Person() p.speak 输出: ---调用的是get函数--- speak: hello world 做一个求和属性sum,统计所有输入的...
def class_method(cls): print(f"The species of {cls.__name__} is {cls.species}") # 静态方法,通过装饰器@staticmethod定义,不属于类也不属于类的实例,只是和类关联在一起 @staticmethod def static_method(): print("This is a static method.") ...
classAnimal:# Animal类的构造方法(也称为初始化方法),用于在创建类的实例时初始化对象的状态。# self代表新创建的Animal实例,name是传递给构造方法的参数。def__init__(self,name):self.name=name# 抽象方法,用于定义动物的发声行为。# 它在基类中没有具体实现,而是要求派生类提供具体的实现。# self表示调用spe...
def get_name(self):"返回类的实例的名称"return self.name 上面代码仍然是保留缩进的。如果你试图返回类的实例（比如demo.py中定义的instance_of_a）的源代码，则会抛出TypeError异常。异常内容如下：“TypeError: module, class, method, function, traceback, frame, or code object was expected, got A”等...
def __init__(self, name, age): print("__init__方法执行啦") g = Girl() """ __new__方法执行啦 instance: <__main__.Girl object at 0x000002C0F16FA1F0> type(instance): <class '__main__.Girl'> """ 1. 2. 3. 4.