无法安装 enum==0.4.7

Question

我的 python 版本是 3.8.1，我无法安装 enum==0.4.7

Collecting enum==0.4.7
  Using cached enum-0.4.7.tar.gz (20 kB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [8 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 11, in <module>
        File "C:\python381\lib\tokenize.py", line 32, in <module>
          import re
        File "C:\python381\lib\re.py", line 143, in <module>
          class RegexFlag(enum.IntFlag):
      AttributeError: module 'enum' has no attribute 'IntFlag'
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

它说： AttributeError：模块“enum”没有属性“IntFlag”

Answer 1

是的，这有助于找到我的答案。我浏览了官方枚举网站 https://pypi.org/project/project/enum/ 我我在寻找什么。
枚举是Python3的标准库。不能由PIP安装