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tox but with conda

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[tox]( but with conda.

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This is a really rough hack to replicate tox using conda (Note that tox is professionally supported whilst ctox isn’t supported). In the long-term a much better solution is to add conda support to tox…


  • conda envs and dependancies are cached (very naively)
  • some tox substitutions (some missing features)
  • ~~no~~ some cli options (lots of missing features)
  • no parallel support (yet)
  • bugs (probably lots)

However, the neat thing is that it makes tox-like testing on a machine with conda installed, but not all python versions are installed.

In conclusion, you’re probably better off using tox, here be :dragon:s.


Have conda installed on your system. The recommended way (I think) is via [miniconda](, the not recommended way (which will almost certainly fail) is via pip, please don’t use this with conda installed via pip.

In the project’s directory (which has a tox.ini file):

`sh cd project_dir ctox # or to pdb into any failing environments ctox -- --pdb --pdb-fail ` Note this assumes you have something like `nosetest {posargs}` (or `py.test {posargs}`) in the projects tox.ini file. which this will be replaced with `nosetest –pdb –pdb-fail` (or `py.test –pdb –pdb-fail`).


I was sick of InterpreterNotFound when trying to use tox having installed python with conda. This solves that and I thought it wouldn’t take very long to put together. No doubt I should’ve just hacked on tox, which in the long-run will be the best solution, but there you are!

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