面向对象_反射

反射

hasattr（）函数用于判断对象是否包含对应的属性，返回布尔值，有的话返回True没有返回False

 

class Person(object):
    city = "beijing"

    def __init__(self, name):
        self.name = name

    def talk(self):
        print("{} are you ok".format(self.name))


p1 = Person("李大伟")
print(hasattr(p1, "address"))  # False
print(hasattr(p1, "city"))  # True

getattr（）返回一个对象的属性值

获取对象的属性和方法，有则返属性，无则返回默认值，默认值可以自己设置

class Person(object):
    city = "beijing"

    def __init__(self, name):
        self.name = name

    def talk(self):
        print("{} are you ok".format(self.name))


p1 = Person("李大伟")
print(getattr(p1, "name"))  # 获取属性
print(getattr(p1, "talk"))  # 获取方法的内存地址
print(getattr(p1, "speak", "无此属性"))  # 没有此属性

 

 

setattr 给一个对象设置属性

delattr 给一个对象删除属性

class Person(object):
    city = "beijing"

    def __init__(self, name):
        self.name = name

    def talk(self):
        print("{} are you ok".format(self.name))


p1 = Person("李大伟")
setattr(p1, "speak", "chinese")

print(p1.__dict__)  # {'name': '李大伟', 'speak': 'chinese'}

delattr(p1, "name")
print(p1.__dict__)  # {'speak': 'chinese'}