python常见函数之 isinstance和type的区别

isinstance

isinstance 会去查找继承链

type

type 只判断变量的内存地址

代码解释

class A:
    pass

class B(A):
    pass

b = B()
print(isinstance(b, B)) # True
print(isinstance(b, A)) # True

# is 判断 id 的意思
print(type(b) is B) # True
print(type(b) is A)     # False