Python子类判断issubclass和实例判断isinstance

1、继承关系

# -*- coding: utf-8 -*-


class Animal(object): pass


class Cat(Animal): pass


class Dog(Animal): pass


cat = Cat()

  

 

  
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2、子类判断
issubclass(x, A_tuple)

print(issubclass(Cat, Animal))  # True
print(issubclass(Cat, Dog))  # False

# 两种方式等价
print(issubclass(Cat, (Animal, Dog)))  # True
print(issubclass(Cat, Animal) or issubclass(Cat, Dog))  # True

  

 

  
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3、实例判断
isinstance(x, A_tuple)

print(isinstance(cat, Animal))  # True
print(isinstance(cat, Cat))  # True
print(isinstance(cat, Dog))  # False

# 两种方式等价
print(isinstance(cat, (Cat, Dog)))  # True
print(isinstance(cat, Cat) or isinstance(cat, Dog))  # True

  

 

  
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4、获取类的子类

# -*- coding: utf-8 -*-


class A(object): pass


class B(A): pass


class C(A): pass


for clazz in A.__subclasses__(): print(clazz.__name__)
# B C

  

 

  
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文章来源: pengshiyu.blog.csdn.net，作者：彭世瑜，版权归原作者所有，如需转载，请联系作者。

原文链接：pengshiyu.blog.csdn.net/article/details/105414297