python 对象的常见方法

class User:
    def __init__(self, name, age, address, course, grade=None):
        self.name = name
        self.__age = age
        self.address = address
        self.course = course
        self.grade = grade

    def test(self):
        print("test")


u = User("1", 2, 3, 4)

print(u.name,u.address,u._User__age)
print(u)  # 对象类型 <__main__.User object at 0x1068aa2b0>
print(u.__dict__)  # 把实例对象中的属性转为json
print(type(u.__dict__))  # 返回<class 'dict'>

print(u.__getattribute__("name"))  # 获取属性的值
u.__delattr__("name")  # 删除对象的属性

print(u.__getattribute__("__age"))  # 返回 AttributeError: 'User' object has no attribute '__age'
print(u.__getattribute__("age"))  # AttributeError: 'User' object has no attribute 'age'
print(u.__getattribute__("_User__age"))  # 获取隐藏属性的值