目录索引

• ==1. hasattr()：==
• ==2. getattr()：==
• • 有：
  • 没有则报错：
• ==3. setattr()：==
• ==4. delattr():==
• ==5. issubclass():==
• ==6. isinstance():==
• • 判断前面是不是属于后面的类型：
  • 判断前面是不是属于后面的类型之一：
  • 判断前面是不是属于后面的实例化对象：

• 我们先创建一个类，用于后面举例子时使用，默认携带该例子

class Person(object):
    def __init__(self,name,age,sex):
        self.name = name
        self.age = age
        self.sex = sex
    
    def run(self):
        print(f"{self.name}的年龄是{self.age}性别是{self.sex}")

people = Person("小明",18,"男")
people.run()

1. hasattr()：

print(hasattr(Person,"age"))#如果第一个参数是类名，无论有没有属性都是False
print(hasattr(people,"age"))
print(hasattr(people,"height"))

呈现效果：

2. getattr()：

有：

print(getattr(people,"name"))

没有则报错：

print(getattr(people,"height"))

3. setattr()：

setattr(people,"height",180)#增加了一个属性
print(hasattr(people,"height"))#变为了True
setattr(people,"sex","女")
print(getattr(people,"sex"))#变成了"女"

4. delattr():

delattr(people,"name")
print(hasattr(people,"name"))#变成了False

5. issubclass():

class Person1(Person):
    pass

class Person2(object):
    pass

print(issubclass(Person1,Person))
print(issubclass(Person2,Person))

6. isinstance():

判断前面是不是属于后面的类型：

a = 3
print(isinstance(a,int))#True
print(isinstance(a,str))#False

判断前面是不是属于后面的类型之一：

a = 3
print(isinstance(a,(int,str)))#True
print(isinstance(a,(str,list)))#False

判断前面是不是属于后面的实例化对象：

print(isinstance(people,Person))#True
print(isinstance(people,Person1))#False