Styjun

I'm setting up a reusable package for Django. I'm using Poetry as the package manager and I'm using tox for testing across multiple python environments. However, I keep on receiving the following error on CircleCI:

py27-django111: commands succeeded
ERROR: py34-django111: InterpreterNotFound: python3.4
ERROR: py34-django20: InterpreterNotFound: python3.4
ERROR: py34-django21: InterpreterNotFound: python3.4
 py35-django111: commands succeeded
 py35-django20: commands succeeded
 py35-django21: commands succeeded
 py36-django111: commands succeeded
 py36-django20: commands succeeded
 py36-django21: commands succeeded
ERROR: py37-django111: InterpreterNotFound: python3.7
ERROR: py37-django20: InterpreterNotFound: python3.7
ERROR: py37-django21: InterpreterNotFound: python3.7

I couldn't find any reports on how to solve this issue and I've seen different Django package projects in CircleCI however they differ on their approaches to build the environments.

My circle.yml file:

version: 2

jobs:
 development:
 docker:
 - image: circleci/python:3.6.8

 steps:
 - checkout
 - run:
 name: Install
 command: |
 poetry install
 - run:
 name: Lint
 command: |
 poetry run flake8 django_package
 - run:
 name: Test
 command: |
 poetry run tox
 - run:
 name: Codecov
 command: |
 poetry run codecov

 deployment:
 docker:
 - image: circleci/python:3.6.8

 steps:
 - checkout
 - run:
 name: Publish
 command: |
 poetry publish --build --username "$PYPI_USERNAME" --password "$PYPI_PASSWORD" --no-interaction

workflows:
 version: 2

 development-workflow:
 jobs:
 - development

 deployment-workflow:
 jobs:
 - development:
 filters:
 tags:
 only: /v[0-9]+(.[0-9]+)*/
 branches:
 ignore: /.*/
 - deployment:
 requires:
 - development
 filters:
 tags:
 only: /v[0-9]+(.[0-9]+)*/
 branches:
 ignore: /.*/

My tox.ini file:

[tox]
skipsdist = True
envlist =
 py27-django111
 py34,py35,py36,py37-django111,20,21

[testenv]
whitelist_externals = poetry
skip_install = true
commands =
 poetry run coverage run --branch runtests.py tests

deps =
 django111: Django>=1.11,<2.0
 django20: Django>=2.0,<2.1
 django21: Django>=2.1

My pyproject.toml file:

[tool.poetry.dependencies]
python = "*"
django = "*"

[tool.poetry.dev-dependencies]
coverage = "^4.5"
codecov = "^2.0"
flake8 = "^3.7"
tox = "^3.7"

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

I found that in order to run python 3.4 and 3.7 on CircleCI using Tox, one should add py340 and py370 instead of py34 and py37. Go figure!