《Python核心编程》中 `type(a)== type(b)` 与 `type(a) is type(b)`的区别

Answer 1

is check 两边的值是否为同一对象. == 实际上call了左值的__eq__(), 然后pass给右值.

Answer 2

http://blog.csdn.net/imzoer/article/details/8637408

Answer 3

== 是比大小
is 是找地址
找地址更快、高效

Answer 4

type(a) == type(b) ： a，b继承的类 (类也是基类的实例) 值相等 就像：

c = [1,2,3]
d = [1,2,3]
c ＝＝ d
>>> True
c is d
>>> false

type(a) == type(b)： a，b继承的类 是同一个实例（内存地址相同）就像

c = 1
d = 1
c == d
>>> True
c is d
>>> True

Answer 5

也举个例子

class A(object):
    def __eq__(self, other):
        return False

a = A()
print(a == a)   #False
print(a is a)   #True