Dependency errors when using python 3.9 and 3.8

Issue

When using python version 3.9: For me, all nox sessions where install_with_constrains is used with python version 3.9 fail.

For instance running the tests session works fine, till chapter 4. After adding more nox sessions and installing more dependencies I started to see multiple dependencies for different python versions (I am following the tutorial using python 3.9 and 3.8 respectively).

After some research, it seems this problem is related to Duplicate dependency export #1970

Console Output

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nox > Running session tests-3.9
nox > Re-using existing virtual environment at .nox/tests-3-9.
nox > poetry install --no-dev
Installing dependencies from lock file

Package operations: 2 installs, 0 updates, 11 removals

  • Removing coverage (5.3)
  • Removing iniconfig (1.1.1)
  • Removing packaging (20.4)
  • Removing pluggy (0.13.1)
  • Removing py (1.9.0)
  • Removing pyparsing (2.4.7)
  • Removing pytest (6.1.1)
  • Removing pytest-cov (2.10.1)
  • Removing pytest-mock (3.3.1)
  • Removing six (1.15.0)
  • Removing toml (0.10.1)
  • Installing mypy-extensions (0.4.3)
  • Installing typing-extensions (3.7.4.3)

Installing the current project: hypermodern-bersten (0.1.0)
nox > poetry export --dev --format=requirements.txt --output=/tmp/tmppd82bei6
nox > pip install --constraint=/tmp/tmppd82bei6 coverage[toml] pytest pytest-cov pytest-mock
nox > Command pip install --constraint=/tmp/tmppd82bei6 coverage[toml] pytest pytest-cov pytest-mock failed with exit code 1:
Ignoring atomicwrites: markers 'python_version >= "3.5" and python_full_version < "3.0.0" and sys_platform == "win32" and (python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.5") or sys_platform == "win32" and python_version >= "3.5" and python_full_version >= "3.4.0" and (python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.5")' don't match your environment
Ignoring attrs: markers 'python_version == "3.8" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version == "3.8"' don't match your environment
Ignoring colorama: markers 'python_version >= "3.5" and python_full_version < "3.0.0" and sys_platform == "win32" and (python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.5") and platform_system == "Windows" or sys_platform == "win32" and python_version >= "3.5" and python_full_version >= "3.5.0" and (python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.5") and platform_system == "Windows"' don't match your environment
Ignoring decorator: markers 'python_version == "3.8" and python_full_version < "3.0.0" and python_full_version >= "2.7.0" or python_version == "3.8" and python_full_version >= "3.2.0"' don't match your environment
Ignoring importlab: markers 'python_version == "3.8" and python_full_version >= "2.7.0"' don't match your environment
Ignoring networkx: markers 'python_version == "3.8" and python_full_version >= "2.7.0"' don't match your environment
Ignoring ninja: markers 'python_version == "3.8"' don't match your environment
Ignoring pytype: markers 'python_version == "3.8"' don't match your environment
Ignoring pyyaml: markers 'python_version == "3.8" and python_full_version < "3.0.0" or python_version == "3.8" and python_full_version >= "3.5.0"' don't match your environment
Ignoring six: markers 'python_version == "3.8" and python_full_version < "3.0.0" and python_full_version >= "2.7.0" or python_version == "3.8" and python_full_version >= "3.4.0"' don't match your environment
Ignoring typed-ast: markers 'python_version == "3.8"' don't match your environment
Collecting coverage==5.3
  Using cached coverage-5.3-cp39-cp39-manylinux1_x86_64.whl (228 kB)
Collecting pytest-cov==2.10.1
  Using cached pytest_cov-2.10.1-py2.py3-none-any.whl (19 kB)
Collecting pytest-mock==3.3.1
  Using cached pytest_mock-3.3.1-py3-none-any.whl (11 kB)
Collecting pytest==6.1.1
  Using cached pytest-6.1.1-py3-none-any.whl (272 kB)
Collecting toml==0.10.1
  Using cached toml-0.10.1-py2.py3-none-any.whl (19 kB)
Requirement already satisfied: attrs>=17.4.0 in ./.nox/tests-3-9/lib/python3.9/site-packages (from pytest==6.1.1->-c /tmp/tmppd82bei6 (line 176)) (20.2.0)
Collecting pluggy==0.13.1
  Using cached pluggy-0.13.1-py2.py3-none-any.whl (18 kB)
Collecting iniconfig==1.1.1
  Using cached iniconfig-1.1.1-py2.py3-none-any.whl (5.0 kB)
Collecting packaging==20.4
  Using cached packaging-20.4-py2.py3-none-any.whl (37 kB)
Collecting py==1.9.0
  Using cached py-1.9.0-py2.py3-none-any.whl (99 kB)
Collecting pyparsing==2.4.7
  Using cached pyparsing-2.4.7-py2.py3-none-any.whl (67 kB)
Collecting six
ERROR: In --require-hashes mode, all requirements must have their versions pinned with ==. These do not:
    six from https://files.pythonhosted.org/packages/ee/ff/48bde5c0f013094d729fe4b0316ba2a24774b3ff1c52d924a8a4cb04078a/six-1.15.0-py2.py3-none-any.whl#sha256=8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced (from packaging==20.4->-c /tmp/tmppd82bei6 (line 146))
nox > Session tests-3.9 failed.

[cjolowicz]

For everyone not using the Cookiecutter and/or nox-poetry, I would recommend passing --without-hashes to poetry export, and using pip’s new resolver.

[flickerfly]

This seems to continue to persist in 3.10.

$ nox -rs mypy
nox > Running session mypy
nox > Creating virtual environment (virtualenv) using python.BAT in .nox\mypy
nox > poetry export --dev --format=requirements.txt '--output=C:\Users\RITCHI~1.JOS\AppData\Local\Temp\tmpxcsboakw'
nox > python -m pip install '--constraint=C:\Users\RITCHI~1.JOS\AppData\Local\Temp\tmpxcsboakw' mypy
nox > Command python -m pip install '--constraint=C:\Users\RITCHI~1.JOS\AppData\Local\Temp\tmpxcsboakw' mypy failed with exit code 1:
Collecting mypy
ERROR: In --require-hashes mode, all requirements must have their versions pinned with ==. These do not:
    mypy from https://files.pythonhosted.org/packages/37/bf/5729b25e84b0048f4ca249a10f5d5c1cc9210b40a7496435b4b872b874b6/mypy-0.931-cp310-cp310-win_amd64.whl#sha256=7b3f6f557ba4afc7f2ce6d3215d5db279bcf120b3cfd0add20a5d4f4abdae5bc
nox > Session mypy failed.