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
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