如何在python中取回枚举元素的名称？
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How to get back name of the enum element in python?
提问by Mike
I have an enum defined like this:
我有一个像这样定义的枚举：
def enum(**enums):
return type('Enum', (), enums)
Status = enum(
STATUS_OK=0,
STATUS_ERR_NULL_POINTER=1,
STATUS_ERR_INVALID_PARAMETER=2)
I have a function that returns status as Statusenum.
How can I get the name of the enum value, and not just value?
我有一个将状态返回为Status枚举的函数。如何获取枚举值的名称，而不仅仅是值？
>>> cur_status = get_Status()
>>> print(cur_status)
1
I would like to get STATUS_ERR_NULL_POINTER, instead of 1
我想得到STATUS_ERR_NULL_POINTER，而不是1
回答by Martijn Pieters
You'd have to loop through the class attributes to find the matching name:
您必须遍历类属性才能找到匹配的名称：
name = next(name for name, value in vars(Status).items() if value == 1)
The generator expression loops over the attributes and their values (taken from the dictionary produced by the vars()function) then returns the first one that matches the value 1.
生成器表达式循环遍历属性及其值（取自vars()函数生成的字典），然后返回与值匹配的第一个1。
Enumerations are better modelled by the enumlibrary, available in Python 3.4 or as a backport for earlier versions:
枚举由enum库更好地建模，可在 Python 3.4 中使用或作为早期版本的反向移植：
from enum import Enum
class Status(Enum):
STATUS_OK = 0
STATUS_ERR_NULL_POINTER = 1
STATUS_ERR_INVALID_PARAMETER = 2
giving you access to the name and value:
使您可以访问名称和值：
name = Status(1).name # gives 'STATUS_ERR_NULL_POINTER'
value = Status.STATUS_ERR_NULL_POINTER.value # gives 1
回答by techneer
You don't need to loop through the Enum class but just access _member_map_.
您不需要遍历 Enum 类，而只需访问 _member_map_。
>>> Status._member_map_['STATUS_OK']
<Status.STATUS_OK: 0>
