# 什么是反射？可以用字符串的方式去访问对象的属性
class Test():
    _name = "sss"
    def fun(self):
        return "Helloword"

t = Test()
# print(hasattr(t,"_name"))   #hasattr(obj,name)#查看类里面有没有name属性
# print(hasattr(t,"fun"))  #True

if hasattr(t,"_name"):
    print(getattr(t,"_name"))   #sss
if hasattr(t,"fun"):
    print(getattr(t,"fun")())  #Helloword
    if  not hasattr(t,"age"):  #如果属性不存在
        print("没有该属性和方法，我来给设置一个")
        setattr(t,"age","18")  #给t对象设置一个默认值，默认age=18
        print(getattr(t,"age"))