Read the Docs build information
Build id: 1023127
Project: leapyear-python-docs
Version: 3.3
Commit: 1f89cd8937d367448c221b1493cf4e58aeb17b7f
Date: 2022-07-21T20:11:16.862997Z
State: finished
Success: False


[rtd-command-info] start-time: 2022-07-21T20:11:18.717240Z, end-time: 2022-07-21T20:11:23.719302Z, duration: 5, exit-code: 0
git clone --no-single-branch --depth 50 git@github.com:LeapYear/python-docs.git .
Cloning into '.'...
Warning: Permanently added 'github.com,192.30.255.112' (ECDSA) to the list of known hosts.

[rtd-command-info] start-time: 2022-07-21T20:11:24.114550Z, end-time: 2022-07-21T20:11:24.220379Z, duration: 0, exit-code: 0
git checkout --force origin/3.3
Note: switching to 'origin/3.3'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 1f89cd8 FIX: Try empty backend directory

[rtd-command-info] start-time: 2022-07-21T20:11:24.696508Z, end-time: 2022-07-21T20:11:24.788874Z, duration: 0, exit-code: 0
git clean -d -f -f


[rtd-command-info] start-time: 2022-07-21T20:11:25.777478Z, end-time: 2022-07-21T20:11:30.242485Z, duration: 4, exit-code: 0
python3.7 -mvirtualenv /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3
Using base prefix '/home/docs/.pyenv/versions/3.7.9'
New python executable in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/bin/python3.7
Also creating executable in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/bin/python
Installing setuptools, pip, wheel...
done.

[rtd-command-info] start-time: 2022-07-21T20:11:30.436963Z, end-time: 2022-07-21T20:11:32.157673Z, duration: 1, exit-code: 0
/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/bin/python -m pip install --upgrade --no-cache-dir pip setuptools<58.3.0
Requirement already satisfied: pip in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (22.2)
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Installing collected packages: setuptools
  Attempting uninstall: setuptools
    Found existing installation: setuptools 63.2.0
    Uninstalling setuptools-63.2.0:
      Successfully uninstalled setuptools-63.2.0
Successfully installed setuptools-58.2.0

[rtd-command-info] start-time: 2022-07-21T20:11:32.386987Z, end-time: 2022-07-21T20:11:39.922817Z, duration: 7, exit-code: 0
/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/bin/python -m pip install --upgrade --no-cache-dir mock==1.0.1 pillow==5.4.1 alabaster>=0.7,<0.8,!=0.7.5 commonmark==0.8.1 recommonmark==0.5.0 sphinx<2 sphinx-rtd-theme<0.5 readthedocs-sphinx-ext<2.2 jinja2<3.1.0
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Building wheels for collected packages: mock, future
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Successfully built mock future
Installing collected packages: snowballstemmer, pytz, mock, alabaster, urllib3, sphinxcontrib-serializinghtml, six, pyparsing, Pygments, pillow, MarkupSafe, imagesize, idna, future, docutils, charset-normalizer, certifi, babel, sphinxcontrib-websupport, requests, packaging, jinja2, commonmark, sphinx, readthedocs-sphinx-ext, sphinx-rtd-theme, recommonmark
Successfully installed MarkupSafe-2.1.1 Pygments-2.12.0 alabaster-0.7.12 babel-2.10.3 certifi-2022.6.15 charset-normalizer-2.1.0 commonmark-0.8.1 docutils-0.17.1 future-0.18.2 idna-3.3 imagesize-1.4.1 jinja2-3.0.3 mock-1.0.1 packaging-21.3 pillow-5.4.1 pyparsing-3.0.9 pytz-2022.1 readthedocs-sphinx-ext-2.1.8 recommonmark-0.5.0 requests-2.28.1 six-1.16.0 snowballstemmer-2.2.0 sphinx-1.8.6 sphinx-rtd-theme-0.4.3 sphinxcontrib-serializinghtml-1.1.5 sphinxcontrib-websupport-1.2.4 urllib3-1.26.10

[rtd-command-info] start-time: 2022-07-21T20:11:40.104487Z, end-time: 2022-07-21T20:11:43.942089Z, duration: 3, exit-code: 0
/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/bin/python -m pip install --exists-action=w --no-cache-dir -r requirements/docs-requirements.txt
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Requirement already satisfied: MarkupSafe>=2.0 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from Jinja2<3.1->-r requirements/docs-requirements.txt (line 6)) (2.1.1)
Requirement already satisfied: pytz>=2015.7 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from babel>=1.3->sphinx<4.0.0,>=2.1.2->-r requirements/docs-requirements.txt (line 2)) (2022.1)
Requirement already satisfied: future in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from commonmark>=0.7.3->recommonmark>=0.5.0->-r requirements/docs-requirements.txt (line 1)) (0.18.2)
Requirement already satisfied: certifi>=2017.4.17 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from requests>=2.5.0->sphinx<4.0.0,>=2.1.2->-r requirements/docs-requirements.txt (line 2)) (2022.6.15)
Requirement already satisfied: urllib3<1.27,>=1.21.1 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from requests>=2.5.0->sphinx<4.0.0,>=2.1.2->-r requirements/docs-requirements.txt (line 2)) (1.26.10)
Requirement already satisfied: charset-normalizer<3,>=2 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from requests>=2.5.0->sphinx<4.0.0,>=2.1.2->-r requirements/docs-requirements.txt (line 2)) (2.1.0)
Requirement already satisfied: idna<4,>=2.5 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from requests>=2.5.0->sphinx<4.0.0,>=2.1.2->-r requirements/docs-requirements.txt (line 2)) (3.3)
Requirement already satisfied: pyparsing!=3.0.5,>=2.0.2 in /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages (from packaging->sphinx<4.0.0,>=2.1.2->-r requirements/docs-requirements.txt (line 2)) (3.0.9)
Building wheels for collected packages: backend
  Building wheel for backend (setup.py): started
  Building wheel for backend (setup.py): finished with status 'done'
  Created wheel for backend: filename=backend-0.2.4.1-py3-none-any.whl size=6661 sha256=96b401846d04e1ca706cb858fa1042114160ac9cdc196479067952c282488ee2
  Stored in directory: /tmp/pip-ephem-wheel-cache-l295evyh/wheels/86/0d/ab/5879956db54fe9e2b76c629315acdde215ea589f55bf4b5b1f
Successfully built backend
Installing collected packages: backend, sphinxcontrib-qthelp, sphinxcontrib-jsmath, sphinxcontrib-htmlhelp, sphinxcontrib-devhelp, sphinxcontrib-applehelp, pydocstyle, docutils, sphinx, sphinx-autodoc-typehints
  Attempting uninstall: docutils
    Found existing installation: docutils 0.17.1
    Uninstalling docutils-0.17.1:
      Successfully uninstalled docutils-0.17.1
  Attempting uninstall: sphinx
    Found existing installation: Sphinx 1.8.6
    Uninstalling Sphinx-1.8.6:
      Successfully uninstalled Sphinx-1.8.6
Successfully installed backend-0.2.4.1 docutils-0.16 pydocstyle-6.1.1 sphinx-3.5.4 sphinx-autodoc-typehints-1.12.0 sphinxcontrib-applehelp-1.0.2 sphinxcontrib-devhelp-1.0.2 sphinxcontrib-htmlhelp-2.0.0 sphinxcontrib-jsmath-1.0.1 sphinxcontrib-qthelp-1.0.3

[rtd-command-info] start-time: 2022-07-21T20:11:44.182392Z, end-time: 2022-07-21T20:11:46.536355Z, duration: 2, exit-code: 2
/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/bin/python -m pip install --upgrade --upgrade-strategy eager --no-cache-dir .
Processing /home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/checkouts/3.3
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
ERROR: Exception:
Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 167, in exc_logging_wrapper
    status = run_func(*args)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/cli/req_command.py", line 247, in wrapper
    return func(self, options, args)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 370, in run
    reqs, check_supported_wheels=not options.target_dir
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 73, in resolve
    collected = self.factory.collect_root_requirements(root_reqs)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/factory.py", line 493, in collect_root_requirements
    requested_extras=(),
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/factory.py", line 458, in _make_requirement_from_install_req
    version=None,
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/factory.py", line 211, in _make_candidate_from_link
    version=version,
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 303, in __init__
    version=version,
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 162, in __init__
    self.dist = self._prepare()
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 231, in _prepare
    dist = self._prepare_distribution()
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 308, in _prepare_distribution
    return preparer.prepare_linked_requirement(self._ireq, parallel_builds=True)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 438, in prepare_linked_requirement
    return self._prepare_linked_requirement(req, parallel_builds)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 529, in _prepare_linked_requirement
    self.check_build_deps,
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 69, in _get_prepared_distribution
    finder, build_isolation, check_build_deps
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/distributions/sdist.py", line 48, in prepare_distribution_metadata
    self._install_build_reqs(finder)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/distributions/sdist.py", line 118, in _install_build_reqs
    build_reqs = self._get_build_requires_wheel()
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/distributions/sdist.py", line 95, in _get_build_requires_wheel
    return backend.get_requires_for_build_wheel()
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_internal/utils/misc.py", line 685, in get_requires_for_build_wheel
    return super().get_requires_for_build_wheel(config_settings=cs)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_vendor/pep517/wrappers.py", line 173, in get_requires_for_build_wheel
    'config_settings': config_settings
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_vendor/pep517/wrappers.py", line 332, in _call_hook
    raise BackendUnavailable(data.get('traceback', ''))
pip._vendor.pep517.wrappers.BackendUnavailable: Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 89, in _build_backend
    obj = import_module(mod_path)
  File "/home/docs/checkouts/readthedocs.org/user_builds/leapyear-python-docs/envs/3.3/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'backend'