How to run Tox with Travis-CI

Question

How do you test different Python versions with Tox from within Travis-CI?

I have a tox.ini:

[tox]
envlist = py{27,33,34,35}
recreate = True
         


        

Answer 1

Travis provides the python version for each test as TRAVIS_PYTHON_VERSION, but in the form '3.4', while tox expects 'py34'.

If you don't want to rely on an external lib (tox-travis) to do the translation, you can do that manually:

language: python
python:
-   "2.7"
-   "3.3"
-   "3.4"
-   "3.5"
install:
-   pip install tox
script:
-   tox -e $(echo py$TRAVIS_PYTHON_VERSION | tr -d .)

Search this pattern in a search engine and you'll find many projects using it.

This works for pypy as well:

tox -e $(echo py$TRAVIS_PYTHON_VERSION | tr -d . | sed -e 's/pypypy/pypy/')

Source: flask-mongoengine's .travis.yml.