La compilación de Read-the-docs falla con "no se puede importar el nombre 'PackageFinder' de 'pip._internal.index'"

La compilación de documentos de Sphinx en read-the-docs falla con el siguiente error (complete el registro a continuación):

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)

¿Hice algo mal o es un error en leer los documentos?

Una compilación local de documentos de Sphinx funciona bien.

Registro de errores completo en read-the-docs:

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)

El problema y la solución se describen en el problema de lectura de documentos # 6554 ( https://github.com/readthedocs/readthedocs.org/issues/6554 ):

Actualmente, todas las compilaciones fallan porque la actualización automática (desde # 4823) a pip 20.0 tenía errores (ver pypa / pip # 7620). Ahora hay una versión 20.0.1 que parece haber solucionado el problema para otros ... pero ¿cómo puedo obligar a mis readthedocs a actualizar también a la versión .1?

La solución es eliminar el entorno de compilación de la siguiente manera (esto se toma de https://docs.readthedocs.io/en/stable/guides/wipe-environment.html ):

• Inicie sesión para leer los documentos
• Ir a versiones
• Haga clic en el botón Editar de la versión que desea borrar en el lado derecho de la página
• Vaya a la parte inferior de la página y haga clic en el enlace de limpieza, junto al botón "Guardar"
• ¡Ahora puede reconstruir la versión con un nuevo entorno de construcción!

Esta solución funcionó para mí (pero a partir del 26 de enero de 2020 debe eliminar el entorno de cada compilación; vea el comentario de Grimmy a continuación).