Python中的is和==的区别

1. is 是比较内存地址id（）

a = "YongJie"

b = "YongJie"

print(id(a))　　#2331684108696,a的内存地址

print(a is b)　　#判断a的内存地址是否等于b

True

1.1字符串中如果有特殊字符他们的内存地址就不一样

a = "Yong@Jie"
b = "Yong@Jie"
print(a is b)
False

1.2字符串中单个*20以内它们的内存地址一样,单个*21以上内存地址不一致

1.3数字小数据池的范围  -5 ~ 256

n = -6
 n1 = -6
 print(n is n1) 　　 #False

 a = -5
 a1 = -5
 print(a is a1) 　　 #True


 b = 257
 b1 = 257
 print(b is b1) 　　 #True

2. == 是比较值

例：判断a是否等于b

a = "YongJie"

b = "YongJie"

print(a == b)　　#判断a的值是否等于b

True