AttributeError: 'NoneType' 对象没有属性 'excluded_of' [英] AttributeError: 'NoneType' object has no attribute 'excluded_of'

问题描述

通过 pip 安装依赖项时出现属性错误

I am getting attribute error while installing the dependencies via pip

Traceback (most recent call last):
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 210, in _main
    status = self.run(options, args)
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_internal/cli/req_command.py", line 180, in wrapper
    return func(self, options, args)
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 319, in run
    reqs, check_supported_wheels=not options.target_dir
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 122, in resolve
    requirements, max_rounds=try_to_avoid_resolution_too_deep,
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 445, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 344, in resolve
    success = self._backtrack()
  File "/home/jpg/.virtual_env/cloud/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 287, in _backtrack
    criterion = self.state.criteria[name].excluded_of([candidate])
AttributeError: 'NoneType' object has no attribute 'excluded_of'

我的 requirements.txt 看起来像

celery==5.0.2
billiard<4.0,>=3.6.0
redis==3.5.3
redis-log-handler==0.0.1.dev32

推荐答案

Update - 1 (on 2020-12-27)

该问题已在 pip==20.3.3 中修复，因此您不会收到此异常.

Update - 1 (on 2020-12-27)

The issue has been fixed in pip==20.3.3 and thus you will not receive this exception.

但是，(这里)redis-log-handler==0.0.1.dev32 依赖于 redis==3.0.1 但是，你有 redis==3.5.3 在 requirements.txt 上，因此依赖项将无法解析.所以，你会进一步收到一个错误(我会说，一个验证错误)，

But, (here) the redis-log-handler==0.0.1.dev32 depends on redis==3.0.1 but, you have redis==3.5.3 on the requirements.txt and hence the dependencies will not resolve. So, you will further receive and an error (I would say, a validation error) as,

错误:无法安装 -r requirements.txt(第 4 行)和 redis==3.5.3因为这些包版本存在相互冲突的依赖关系.

ERROR: Cannot install -r requirements.txt (line 4) and redis==3.5.3 because these package versions have conflicting dependencies.

冲突是由以下原因引起的:用户请求 redis==3.5.3redis-log-handler 0.0.1.dev32 依赖于 redis==3.0.1

The conflict is caused by: The user requested redis==3.5.3 redis-log-handler 0.0.1.dev32 depends on redis==3.0.1

要解决此问题，您可以尝试:

To fix this you could try to:

1. 放宽您指定的软件包版本范围
2. 删除包版本以允许 pip 尝试解决依赖冲突

这个错误报告非常有用，是时候调整你的包依赖了.

This error report is pretty much helpful and it is time to adjust your package dependencies.

注意: 如果您对调整依赖项不感兴趣并想像以前一样解决它，请阅读以下部分

这是 pip 版本 20.3 的问题并且尚未修复已在pip==20.3.3中修复.

This is an issue with pip version 20.3 and not yet fixed fixed in pip==20.3.3.

安装以前稳定版本的 pip (20.2.X)，

Install the previous stable version of the pip (20.2.X) by,

pip install --upgrade pip~=20.2.0

方法二

在安装要求

pip install -r requirements.txt --use-deprecated=legacy-resolver

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