Runtime ContextualVersionConflict error with setuptools after installing project dependencies

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• [n/a] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Linux 5.1.15-arch1-1-ARCH #1 SMP PREEMPT Tue Jun 25 04:49:39 UTC 2019 x86_64 GNU/Linux

• Poetry version: 0.12.17

• Link of a Gist with the contents of your pyproject.toml file: https://pastebin.com/raw/LLmpq71Y

Issue

The poetry install command completes without errors, but a ContextualVersionConflict error is raised when trying to run a command within the project. It looks like poetry is installing setuptools version 40.8.0, but tensorboard requires at least 41.0.0.

Traceback (most recent call last):
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 583, in _build_master
    ws.require(__requires__)
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 900, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 791, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (setuptools 40.8.0 (/project/.venv/lib/python3.7/site-packages), Requirement.parse('setuptools>=41.0.0'), {'tensorboard'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/project/.venv/bin/science", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3191, in <module>
    @_call_aside
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3175, in _call_aside
    f(*args, **kwargs)
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3204, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 585, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 598, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/project/.venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 791, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (setuptools 40.8.0 (/project/.venv/lib/python3.7/site-packages), Requirement.parse('setuptools>=41.0.0'), {'tensorboard'})

[mitsuse]

While executing pip install, changing the version of setuptools possibly breaks dependencies, so I think poetry run pip install -U setuptools && poetry install is a correct currently and unfortunately. In that sense, I agree this:

I suspect there is a bug related to the order of installs.

https://github.com/sdispater/poetry/issues/1226#issuecomment-513311134

[mitsuse]

This issue seems to be due to venv’s setuptools. I tried a workaround (poetry run pip install -U setuptools before poetry install) and fixed the issue, but I think that the desirable fix is that poetry avoids taking the version of venv’s setuptools into consideration.