How do I specify tox + python version specific requirements

Question

Currently I have the following:

[gh-actions]
python =
    3.7: py37
    3.8: py38
    3.9: py39
    3.10: py310
    pypy-3.7: pypy3
    pypy-3.8: pypy3

[tox]
minversion = 1.9
envlist =
    lint
    py{37,38,39,py3}-django22-{sqlite,postgres}
    py{37,38,39,310,py3}-django32-{sqlite,postgres}
    py{38,39,310,py3}-django40-{sqlite,postgres}
    py310-djangomain-{sqlite,postgres}
    docs
    examples
    linkcheck

toxworkdir = {env:TOX_WORKDIR:.tox}

[testenv]
deps =
    Pillow
    SQLAlchemy
    mongoengine
    django22: Django>=2.2,<2.3
    django32: Django>=3.2,<3.3
    django40: Django>=4.0,<4.1
    djangomain: https://github.com/django/django/archive/main.tar.gz
    py{37,38,39,310}-django{22,32,40,main}-postgres: psycopg2-binary
    py{py3}-django{22,32,40,main}-postgres: psycopg2cffi

I need to install a different psycopg2 depending on cpython vs pypy . I've tried all kinds of combinations, and nothing, it all ends in failure . I can't get any of the *-postgres envs to install.

What I'm doing wrong?

Answer 1

The issue is that you do not run the correct environments in your GitHub Actions.

For example. In your tox.ini you create an env with the name:

py37-django22-alchemy-mongoengine-postgres

Then you define the requirements as following:

py{37,38,39,310}-postgres: psycopg2-binary

Which means - install psycopg2-binary when the env name contains the factors py37 + postgres . This matches the above env! So far so good.

But in your gha your run:

- python-version: "3.7"
  tox-environment: django22-postgres

... which does not contain the py37 factor - so no match - no installation.

The sqlite tests succeed as it sqlite comes along with Python.

I would suggest that you have a look at the django projects in the jazzband github organization . They all are heavy use of tox factors (the parts separated by dashes) and they also use gha - mostly via https://github.com/ymyzk/tox-gh-actions which I would recommend, too.

Basically you just run tox on gha and let the plugin do the heavy lifting of matching Python environments from tox to github.

Disclaimer: I am one of the tox maintainers and you earn a prize for the most complex factor setup I have ever seen :-)

Answer 2

The issue was never tox or tox 's configuration.

The issue was github actions , when you use tox-environment or python-version + tox-environment , tox-gh-actions won't parse it correctly. Causing it to never match.

This is what I removed . This is what tox.ini looks like and what github actions looks like [and line 47]