python interpreter discovery plugin for tox 3 and multipython

This tox plugin comes pre-installed in multipython Docker image and is responsible for resolving tox environment name to Python executable. Most probably, you don't need to install it yourself.

Environment names supported are all multipython tags. More names may be added in the future.

There is one test suite:

1. tox3 — tox>=3,<4 is installed in host tag environment, and tox run is executed on tox.ini with env names equal to target tags. This test includes subtests:
   • assert {env_python} version inside tox env
   • assert python version inside tox env
   • install externally built sample package in tox environment
   • execute entrypoint of sample package

Virtualenv supports discovery plugins since v20. In v20.22, it dropped support for Python <=3.6, in v20.27 it dropped support for Python 3.7.

This is why we use 6 different test setups:

1. tox3 + virtualenv>=20
2. tox3 + virtualenv>=20,<20.27
3. tox3 + virtualenv>=20,<20.22

When tox-multipython is installed inside host tag environment, it allows to use selected ✅ target tag (create virtualenv environment or use as tox env name in env_list) and automatically discovers corresponding multipython executable. For failing 💥 target tag, interpreter is discoverable, but virtual environment with sample package cannot be created.

Host tag and Target tags are valid multipython tags. Host tags are listed vertically (rows), target tags are listed horizontally (columns).

  HOST    TARGETS
——————    A B C D E F G H I J K L M
py314t  A ✅✅✅✅✅✅✅✅✅✅💥💥💥
py313t  B ✅✅✅✅✅✅✅✅✅💥💥💥💥
 py314  C ✅✅✅✅✅✅✅✅✅💥💥💥💥
 py313  D ✅✅✅✅✅✅✅✅✅💥💥💥💥
 py312  E ✅✅✅✅✅✅✅✅✅💥💥💥💥
 py311  F ✅✅✅✅✅✅✅✅✅💥💥💥💥
 py310  G ✅✅✅✅✅✅✅✅✅💥💥💥💥
  py39  H ✅✅✅✅✅✅✅✅✅💥💥💥💥
  py38  I ✅✅✅✅✅✅✅✅✅💥💥💥💥
  py37  J ✅✅✅✅✅✅✅✅✅✅💥💥💥
  py36  K 💥💥💥💥💥✅✅✅✅✅✅✅✅
  py35  L 💥💥💥💥💥✅✅✅✅✅✅✅✅
  py27  M 💥💥💥💥💥✅✅✅✅✅✅✅✅

  HOST    TARGETS
——————    A B C D E F G H I J K L M
py314t  A ✅✅✅✅✅✅✅✅✅✅✅✅✅
py313t  B ✅✅✅✅✅✅✅✅✅✅✅✅✅
 py314  C ✅✅✅✅✅✅✅✅✅✅✅✅✅
 py313  D ✅✅✅✅✅✅✅✅✅✅✅✅✅
 py312  E ✅✅✅✅✅✅✅✅✅✅✅✅✅
 py311  F ✅✅✅✅✅✅✅✅✅✅✅✅✅
 py310  G ✅✅✅✅✅✅✅✅✅✅✅✅✅
  py39  H ✅✅✅✅✅✅✅✅✅✅✅✅✅
  py38  I ✅✅✅✅✅✅✅✅✅✅✅✅✅
  py37  J ✅✅✅✅✅✅✅✅✅✅✅✅✅
  py36  K 💥💥💥💥💥✅✅✅✅✅✅✅✅
  py35  L 💥💥💥💥💥✅✅✅✅✅✅✅✅
  py27  M 💥💥💥💥💥✅✅✅✅✅✅✅✅

  HOST    TARGETS
——————    A B C D E F G H I J K L M
py314t  A ✅✅✅✅✅✅✅✅✅💥💥💥💥
py313t  B ✅✅✅✅✅✅✅✅✅✅💥💥💥
 py314  C ✅✅✅✅✅✅✅✅✅✅💥💥💥
 py313  D ✅✅✅✅✅✅✅✅✅✅💥💥💥
 py312  E ✅✅✅✅✅✅✅✅✅✅💥💥💥
 py311  F ✅✅✅✅✅✅✅✅✅✅💥💥💥
 py310  G ✅✅✅✅✅✅✅✅✅✅💥💥💥
  py39  H ✅✅✅✅✅✅✅✅✅✅💥💥💥
  py38  I ✅✅✅✅✅✅✅✅✅✅💥💥💥
  py37  J ✅✅✅✅✅✅✅✅✅✅💥💥💥
  py36  K 💥💥💥💥💥✅✅✅✅✅✅✅✅
  py35  L 💥💥💥💥💥✅✅✅✅✅✅✅✅
  py27  M 💥💥💥💥💥✅✅✅✅✅✅✅✅

Check CHANGELOG.md