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文档读取失败，并显示“无法从'pip._internal.index'导入名称'PackageFinder'”
Sphinx文档在read-the-docs上的构建失败，并显示以下错误（以下完整日志）： 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) 我做错什么了吗？或者这是阅读文档中的错误？ Sphinx文档的本地版本运行良好。 阅读文档时完整的错误日志： 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: …