freeCodeCamp/guide/chinese/python/difference-between-is-and-equal-equal-operators/index.md

title	localeTitle
Difference between Python 'is' and '==' operators	Python'是'和'=='运算符之间的区别

is是检查对象标识 - 即检查两个或多个变量是否指向同一个对象。你不能超载is 。

如果变量引用的对象相等，则==计算结果为true。您可以通过__eq__运算符重载== 。

回报价值

两者的返回值可以是True或False 。

代码示例

a = 2.3 
 a is 2.3  # => False 
 a == 2.3  # => True 
 
 a = [234,123,321] 
 b = [234,123,321] 
 a == b  # => True 
 a is b  # => False 
 a = b 
 a == b  # => True 
 a is b  # => True, because if we change a, b changes too