travis-ci-python3.7-example

2018-07-01: nearly all travis-ci VMs run Ubuntu trusty which ships with openssl 1.0.1. python3.7 dropped support for end-of-lifed openssl versions.

travis-ci has a xenial distribution which can be enabled with dist: xenial. The python: 3.7-dev virtualenv provided by travis-ci for trusty is still 3.7a4 which is quite a bit different from 3.7.0 final.

deadsnakes provides a backport of python3.7 for ubuntu xenial which can be enabled using the travis-ci apt addon.

This repository contains a sample .travis.yml which installs python3.7 from deadsnakes and invokes tox.

The tl;dr magic to enable this:

dist: xenial
addons:
  apt:
    sources:
    - deadsnakes
    packages:
    - python3.7-dev

It is suggested to use the travis-ci matrix feature to only install python3.7 once as the apt add on adds a significant amount of time to the build. The example .travis.yml does this.

update (2018-07-03)

travis-ci has enabled python: 3.7 on dist: xenial so deadsnakes is no longer necessary:

    - env: TOXENV=py37
      python: 3.7
      dist: xenial

update 2018-10-15: sudo: required is no longer necessary