python之@unique 装饰器在 python 中有什么作用

我最近遇到了这段代码:

@unique 
class NetlistKind(IntEnum): 
  Unknown = 0 
  LatticeNetlist = 1 
  QuartusNetlist = 2 
  XSTNetlist = 4 
  CoreGenNetlist = 8 
  All = 15 

@unique 装饰器的作用是什么？它在上述代码段中的用途是什么？

请您参考如下方法:

总结

unique 是 Enum 的类装饰器，如果有任何重复的枚举值，它会引发 ValueError。

这段代码

from enum import unique, Enum 
 
@unique 
class Mistake(Enum): 
    ONE = 1 
    TWO = 2 
    THREE = 3 
    FOUR = 3 

产生这个错误:

ValueError: duplicate values found in <enum 'Mistake'>: FOUR -> THREE 

更多详情

来自documentation :

上下文

By default, enumerations allow multiple names as aliases for the same value. When this behavior isn’t desired, [unique] can be used to ensure each value is used only once in the enumeration

描述

[unique is] a class decorator specifically for enumerations. It ensures only one name is bound to any one value [in an enum]. [unique] searches an enumeration’s __members__ gathering any aliases it finds; if any are found ValueError is raised with the details