Parallel tests based on Python version

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Lets say I have a script called my_unit_tests.py for an application I am writing that must be comparable with python3 and python2.

It only took me a few minutes of reading the documentation and examples to see how I would achieve this, without parallelism.

machine:
  post:
    - pyenv global 2.7.12 3.5.2
dependencies:
  post:
    - python2.7 setup.py install
    - python3.5 setup.py install
test:
  override:
    - python2.7 my_unit_tests.py
    - python3.5 my_unit_tests.py

I thought it might be nice to have python2.7 my_unit_tests.py happen on one node, and python3.5 my_unit_tests.py happen on another.

Is this easily done? I couldn’t find any examples of anyone doing exactly this, and none of my attempts to get this to happen worked. Any advice is much appreciated.