tox-pyenv-install

Plugin that allows tox to find python executables for python versions that have been installed with pyenv and optionally to install a exact or the latest patch of a python version using pyenv install.

TL;DR: see full tox.ini example to enable.

Intro

The automatic installation of requested versions can be enabled using the tox [testenv] section configuration option tox_pyenv_install_auto_install or the cli flag --tox-pyenv-install-auto-install.

To resolve the latest installable patch version of a minor python version like 3.5 the install candidates of pyenv install -l are parsed.
Optionally instead of installing the latest patch version of a minor version (like 3.5.10 for searched python minor version 3.5) the latest (but earlier) already installed patch version (e.g. 3.5.9) can be used by using the tox [testenv] section configuration option tox_pyenv_install_auto_install_always_latest_patch or the cli flag --tox-pyenv-install-auto-install-always-latest-patch.

To search installed python versions the plugin searches in the versions directory of the pyenv root folder as stated using pyenv root.

Moreover the pyenv executable is searched using the command which (or where for Windows systems) and therefore has to be available in the PATH environment variable.

Use tox -v[v] to increase verbosity and to show log output of tox-env-plugin.

Allowed python version string formats

tox-pyenv-install can parse python version strings in the formats that are used by pyenv.
Those formats include:

• exact notions of a python version like 3.10.0
• dev versions like 3.11-dev
• different implementations versions like anaconda3-5.3.1, pypy-5.7.1 or mambaforge-pypy3

Moreover some of tox default version notation formats are supported. Those formats include:

• minor python version specifier like py35 (for CPython 3.5) or py310 (for CPython 3.10)

Additionally to specifying exact versions like pyenv uses them, shorthand formats are added:

• for minor versions like 3.5 or 3.10 (without specifing the patch version)

In case of specifying a minor version (using toxs or the shorthand format) the tox-pyenv-install plugin resolves the latest available or installed patch version as described in the intro above.

Configuration options and CLI arguments

CLI arguments have precedence over options defined in the tox.ini [testenv] section.

Auto install python versions

The auto installation of python versions is disabled by default.
Use the tox.ini [testenv] section option or the cli argument to enable it.
Important note: When installing versions, pyenv builds python versions from source. Therefore build tools aswell as commonly used libraries or headers for building python are required, as stated in the pyenv wiki.

Auto install python versions using testenv section option

Option: tox_pyenv_install_auto_install
Default: False
Example tox.ini:

[tox]
envlist =
    py35,
    3.9,
    3.5.9
    
[testenv]
tox_pyenv_install_auto_install=True

deps =
    pyparsing
commands =
    pytest

Auto install python versions using CLI argument

Argument: --tox-pyenv-install-auto-install
Default: not set
Example tox call: tox --tox-pyenv-install-auto-install

Always install latest patch version for a minor version

The auto installation of python versions installs the latest patch version (like 3.9.10) of a minor version (like 3.9) by default.
Use the tox.ini [testenv] section option or the cli argument to disable it.

Always install latest patch version for a minor version using testenv section option

Option: tox_pyenv_install_auto_install_always_latest_patch
Default: True
Depends: tox_pyenv_install_auto_install or --tox-pyenv-install-auto-install
Example tox.ini:

envlist =
    py35,
    3.9,
    3.5.9
    
[testenv]
tox_pyenv_install_auto_install=True
tox_pyenv_install_auto_install_always_latest_patch=False

deps =
    pyparsing
commands =
    pytest

Always install latest patch version for a minor version using CLI argument

Argument: --tox-pyenv-install-auto-install-always-latest-patch
Depends: --tox-pyenv-install-auto-install or tox_pyenv_install_auto_install in tox.ini
Default: set
Example tox call: tox --tox-pyenv-install-auto-install --tox-pyenv-install-auto-install-always-latest-patch

Force tox using tox-pyenv-install for python executable resolution

The plugin allows tox to resolve the searched python executables in case tox-pyenv-install can't find or install the requested version.
Use the tox.ini [testenv] section option or the cli argument to disable fallback to toxs resolve strategy.

Force tox using tox-pyenv-install for python executable resolution using testenv section option

Option: tox_pyenv_install_no_fallback
Default: False
Example tox.ini:

[tox]
envlist =
    py310,
    3.9,

[testenv]
tox_pyenv_install_no_fallback=True

deps =
    pyparsing
commands =
    pytest

Force tox using tox-pyenv-install for python executable resolution using CLI argument

Argument: --tox-pyenv-install-no-fallback
Default: not set
Example tox call: tox --tox-pyenv-install-no-fallback

Full example tox configuration

tox.ini file:

[tox]
envlist =
    py310,
    py38,
    py35,
    3.9,
    pypi
    py27,
    py34,
    3.5.9,
    3.11-dev

[testenv]

; auto install
tox_pyenv_install_auto_install=True

; prefer already installed patch versions of minor python versions
; instead of downloading latest patch version for said minor python version
tox_pyenv_install_auto_install_always_latest_patch=False

; only use pyenv to resolve python executables, 
; don't use tox built in resolution strategies
tox_pyenv_install_no_fallback=True

deps =
    pyparsing

commands =
    python -m aenum.test

Based on tox-pyenv

This plugin is a fork of tox-pyenv and modifies and extends it.
The original feature to locate python executables works differently: In difference to tox-pyenv this plugin tox-pyenv-install does not use pyenv which to locate python executables installed using pyenv, but instead searches for python versions in the versions directory of pyenvs root directory.

Credits of the original plugin:
Version: 1.1.0
By: Sam Stavinoha smlstvnh@gmail.com
License: Apache License, Version 2.0