如何修复Python枚举-AttributeError（name）from None错误？ [英] How to fix Python Enum - AttributeError(name) from None error?

问题描述

尝试在Python 3.7.3中使用枚举，出现以下错误。已经尝试安装-和卸载-enum34，但仍然无法正常工作。是否在虚拟环境中进行了所有操作（如错误所示）。

Trying to use an enum in Python 3.7.3, getting the following error. Already tried to install - and uninstall - enum34, but it still does not work. Did all the operations in a virtual environment (as the error shows).

还有其他方法可以解决此问题（除了使用另一个枚举实现，如< a href = https://stackoverflow.com/questions/36932/how-can-i-represent-an-enum-in-python>这个问题）？

Is there anything else I can do to fix this (except using another enum implementation as shown in this question)?

#enum import:
from enum import Enum

# enum definition:
class Status(Enum):
    on: 1
    off: 2

# enum utilisation (another class, same file):
self.status = Status.off

# error:
File "C:\dev\python\test\venv\lib\enum.py", line 349, in __getattr__
AttributeError(name) from None
AttributeError: off

推荐答案

用于定义的正确语法枚举是：

The correct syntax for defining an enum is:

class Status(Enum):
    on = 1
    off = 2

不在上：1 。

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