阅读文档构建失败 "cannot import name 'PackageFinder' from 'pip._internal.index'"

Question

在 read-the-docs 上构建 Sphinx 文档失败并出现以下错误（完整日志如下）：

ImportError: cannot import name 'PackageFinder' from 'pip._internal.index' (/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/index/__init__.py)

我是不是做错了什么或者这是阅读文档中的错误？

Sphinx 文档的本地构建运行良好。

阅读文档时的完整错误日志：

Read the Docs build information
Build id: 10299638
Project: cascade-python
Version: latest
Commit: a7d50bf781bd8076b10dd7024db4ccb628016c27
Date: 2020-01-21T17:03:12.876711Z
State: finished
Success: False


[rtd-command-info] start-time: 2020-01-21T17:03:13.203354Z, end-time: 2020-01-21T17:03:13.215400Z, duration: 0, exit-code: 0
git remote set-url origin https://github.com/brunorijsman/cascade-python.git


[rtd-command-info] start-time: 2020-01-21T17:03:13.276220Z, end-time: 2020-01-21T17:03:13.630658Z, duration: 0, exit-code: 0
git fetch origin --force --tags --prune --prune-tags --depth 50
From https://github.com/brunorijsman/cascade-python
   2a28505..a7d50bf  master     -> origin/master

[rtd-command-info] start-time: 2020-01-21T17:03:13.824496Z, end-time: 2020-01-21T17:03:13.876904Z, duration: 0, exit-code: 0
git checkout --force origin/master
Previous HEAD position was 2a28505 Fix lint
HEAD is now at a7d50bf Trigger docs build

[rtd-command-info] start-time: 2020-01-21T17:03:13.941290Z, end-time: 2020-01-21T17:03:13.951085Z, duration: 0, exit-code: 0
git clean -d -f -f


[rtd-command-info] start-time: 2020-01-21T17:03:16.657644Z, end-time: 2020-01-21T17:03:22.489740Z, duration: 5, exit-code: 0
python3.7 -mvirtualenv --no-site-packages --no-download /home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest
Using base prefix '/home/docs/.pyenv/versions/3.7.3'
New python executable in /home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/bin/python3.7
Not overwriting existing python script /home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/bin/python (you must use /home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/bin/python3.7)
Installing setuptools, pip, wheel...
done.

[rtd-command-info] start-time: 2020-01-21T17:03:22.562608Z, end-time: 2020-01-21T17:03:23.258281Z, duration: 0, exit-code: 1
/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/bin/python -m pip install --upgrade --cache-dir /home/docs/checkouts/readthedocs.org/user_builds/cascade-python/.cache/pip pip
Traceback (most recent call last):
  File "/home/docs/.pyenv/versions/3.7.3/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/docs/.pyenv/versions/3.7.3/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/__main__.py", line 16, in <module>
    from pip._internal import main as _main  # isort:skip # noqa
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/__init__.py", line 40, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/cli/autocompletion.py", line 8, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/cli/main_parser.py", line 12, in <module>
    from pip._internal.commands import (
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/commands/__init__.py", line 6, in <module>
    from pip._internal.commands.completion import CompletionCommand
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/commands/completion.py", line 6, in <module>
    from pip._internal.cli.base_command import Command
  File "/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 25, in <module>
    from pip._internal.index import PackageFinder
ImportError: cannot import name 'PackageFinder' from 'pip._internal.index' (/home/docs/checkouts/readthedocs.org/user_builds/cascade-python/envs/latest/lib/python3.7/site-packages/pip/_internal/index/__init__.py)

Answer 1

阅读文档问题 #6554 (https://github.com/readthedocs/readthedocs.org/issues/6554) 中描述了问题和修复：

目前所有构建都失败了，因为自动升级（自 #4823 起）到 pip 20.0 存在错误（请参阅 pypa/pip#7620）。现在有一个 20.0.1 版本似乎已经解决了其他人的问题......但是我如何强制我的 readthedocs 也升级到 .1 版本？

解决方法是清除构建环境，如下所示（摘自 https://docs.readthedocs.io/en/stable/guides/wipe-environment.html）：

登录阅读文档
转到版本
点击页面右侧您要擦除的版本的编辑按钮
转到页面底部并单击“保存”按钮旁边的擦除 link
现在您可以使用全新的构建环境重新构建版本！

此修复对我有用（但从 2020 年 1 月 26 日起，您必须为每个构建清除环境——请参阅下面来自 Grimmy 的评论）。

阅读文档构建失败 "cannot import name 'PackageFinder' from 'pip._internal.index'"

Read-the-docs build fails with "cannot import name 'PackageFinder' from 'pip._internal.index'"

python

python-sphinx

read-the-docs