Get from GitHub: git clone https://github.com/fauskanger/tox_with_conda.git

Install with pip: pip install tox_with_conda

Install with conda: conda install -c fauskanger tox_with_conda

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Tox with conda

tox is a Python framework for creating multiple environments, and then install your project and run tests in each of them to make the process of running tests across versions an easy task.

However, I (and other) experienced that using tox and conda (miniconda or Anaconda) was at a first glance not a good match, or at least on Windows. Tox expects to work from a virtualenv and not a conda environment. However, it’s possible with a few, simple steps.

Motivation

To use tox and conda on Windows, the following recommendations worked for me:

• For tox to find your environments, consider to either:

  • Install environments in C:\PythonXY, where X and Y is major and minor version, respectively; or
  • Make a symlink from C:\PythonXY to your real path. E.g.: mklink /J C:\Python27 C:\Anaconda3\envs\myPy27env

• In the environment where you call tox: install virtualenv with conda and not with pip. This seems to work well with Anaconda.

Instead of going through these steps manually for each new project, use the ToxEnvMatcher-class or run the tox_with_conda.py-script described in the next section.

Examples on how to use

From code

my_envs = join('E:\\', 'Anaconda3', 'envs')
tem = ToxEnvMatcher(my_envs, env_prefix='py')
for version in '27,34,35,36'.split(','):
    tem.make(version)

This will make four conda environments in the E:\Anaconda3\envs folder:

• E:\Anaconda3\envs\py27
• E:\Anaconda3\envs\py34
• E:\Anaconda3\envs\py35
• E:\Anaconda3\envs\py36

For each of the versions, a symbolic link is made from C:\PythonXY to E:\Anaconda3\envs\pyXY

From command line

Instead of creating a script to use ToxEnvMatcher, the tox_with_conda.py script can be called with arguments:

python tox_with_conda.py E:\Anaconda3\envs 27 34 35 36 37

Note: if installed with pip, then instead of python tox_with_conda.py ... use python -m tox_with_conda ...

Environment prefix (defaults to py) can be overridden with -p/--env_prefix options:

python tox_with_conda.py E:\Anaconda3\envs 27 34 35 36 37 -p Python

This will create new environments in E:\Anaconda3\envs\PythonXY instead of E:\Anaconda3\envs\pyXY

If, for some reason you need to, it's possible to use the -b/--base option to override the default base location (C:\Python):

E:\dev> tox_with_conda.py E:\Anaconda3\envs 27 34 35 36 37 --base D:\Python