Python中a is b和a==b的区别？超详细的介绍来了
陈立鑫
优草派
本篇文章主要给大家详细介绍了在python中a is b和a==b的具体区别，小编讲解得比较详细，大家一定要耐心看完，看完之后一定会有所收获的。那么让我们继续往下看。
a == b ,这是一个比较运算符，它事用于来比较两个对象的value(值)是否相同，相同则返回True 否则返回False
具体事例如下：
# 以下用于示例 a == b 用法 >>> a = 1 # a, b 数值类型 >>> b = 1 >>> a == b True >>> a = 'zhaoxuan'# a,b 字符串类型 >>> b = 'zhaoxuan' >>> a == b True >>> a = [1, 2]# a,b 列表类型 >>> b = [1, 2] >>> a == b True >>> a = 1 # a, b 数值类型 >>> b = 2 >>> a == b False >>> a = 'hello'# a,b 字符串类型 >>> b = 'world' >>> a == b False >>> a = [1, 2]# a,b 列表类型 >>> b = [1, 3] >>> a == b False
2 a is b，用于比较两个对象的物理id。如果相同则返回True，否则返回False
具体事例如下：
# 以下用于示意 a is b 用法:
>>> a = -5# a, b 数值类型
>>> b = -5
>>> a is b
True
>>> a = -6
>>> b = -6
>>> a is b
False
>>> a = 256
>>> b = 256
>>> a is b
True
>>> a = 257
>>> b = 257
>>> a is b
False
>>> b = 'zhaoxuan'# a, b 字符串类型
>>> a = 'zhaoxuan'
>>> a is b
True# 简单字符串可用
>>> id(a)
42111997
>>> id(b)
42111997
>>> a = 'wo shi zhao xuan'
>>> b = 'wo shi zhao xuan'
>>> a is b
False# 复杂字符串不可用
>>> id(a)
2146074255200
>>> id(b)
2146074255272
>>> a = (1,2,3) # a, b 元组类型
>>> b = (1,2,3)
>>> a is b
False
>>> id(a)
2146074256320
>>> id(b)
2146074256378
>>> a = [1,2,3] #a,b list类型
>>> b = [1,2,3]
>>> a is b
False
>>> a = {'a':1,'b':2} #a,b dict类型
>>> b = {'a':1,'b':2}
>>> a is b
False
>>> a = set([1,2,3])#a,b set类型
>>> b = set([1,2,3])
>>> a is b
False
>>> id(a)
2146074299258
>>> id(b)
2146074299236
【原创声明】凡注明“来源：优草派”的文章，系本站原创，任何单位或个人未经本站书面授权不得转载、链接、转贴或以其他方式复制发表。否则，本站将依法追究其法律责任。