关于IntEnum的怪异的“ ImportError”

Question

[今天，我想在Ubuntu 16.04上设置CTFd，但遇到一个奇怪的ImportError。阅读ImportError: cannot import name 'IntEnum'并尝试了所有可以获得的解决方案后，我发现错误仍未解决。

root@iZbp16wvcnnjq61mspee7aZ:/var/www/CTFd# pip install enum34 //As you can see, I have tried to install enum34 :( 
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Looking in indexes: http://mirrors.cloud.aliyuncs.com/pypi/simple/
Requirement already satisfied: enum34 in /usr/local/lib/python2.7/dist-packages (1.1.8)
root@iZbp16wvcnnjq61mspee7aZ:/var/www/CTFd# python serve.py
Traceback (most recent call last):
  File "serve.py", line 11, in <module>
    app = create_app()
  File "/var/www/CTFd/CTFd/__init__.py", line 223, in create_app
    from CTFd.api import api
  File "/var/www/CTFd/CTFd/api/__init__.py", line 2, in <module>
    from flask_restplus import Api
  File "/usr/local/lib/python2.7/dist-packages/flask_restplus/__init__.py", line 4, in <module>
    from . import fields, reqparse, apidoc, inputs, cors
  File "/usr/local/lib/python2.7/dist-packages/flask_restplus/fields.py", line 20, in <module>
    from .errors import RestError
  File "/usr/local/lib/python2.7/dist-packages/flask_restplus/errors.py", line 8, in <module>
    from ._http import HTTPStatus
  File "/usr/local/lib/python2.7/dist-packages/flask_restplus/_http.py", line 6, in <module>
    from enum import IntEnum
ImportError: cannot import name IntEnum  // THE PROBLEM!

Answer 1

我们今天早上遇到了类似的问题，并将enum34固定为1.1.6-他们昨晚发布了1.1.8，由于某种原因，它似乎是一个相对空白的软件包。但是固定为1.1.6对我们有用。

Answer 2

此问题已在enum34 1.1.9中修复。

Answer 3

这可能是由于enum34软件包的最新版本出现问题：https://bitbucket.org/stoneleaf/enum34/issues/27/enum34-118-broken如建议的那样，解决此问题的方法可以是将其版本固定到1.1.6，这可以正常工作。