GitHub - neimad/travis-python: Helps to install Python on Travis CI.

Helps to install Python to Travis CI machines on Linux, macOS and Windows.

Usage

You need to source the provided Bash script and call the install_python() function.

Or just use the shared configuration snippet. The easiest way to do it is to import the shared configuration snippet:

import:
  - source: neimad/travis-python:stable.yml
    mode: deep_merge_prepend

⚠️ The imported configuration needs to be prepended and a deep merge is required to be able to use the installed Python distribution in the before_install and subsequent phases.

Read the configuration documentation to understand how it works.

Then, specify the operating systems as usual:

import:
  - source: neimad/travis-python:stable.yml
    mode: deep_merge_prepend

os:
  - linux
  - osx
  - windows

Finally, specify the wanted Python version using the PYTHON environment variable:

import:
  - source: neimad/travis-python:stable.yml
    mode: deep_merge_prepend

os:
  - linux
  - osx
  - windows

env:
  - PYTHON=3.8
  - PYTHON=3.7
  - PYTHON=2

The Python distribution is installed during the before_install phase and available using the python program name (whether it is Python 2 or 3).

Documentation

Some documentation is available.

Why and how ?

To provide a similar Python environment for the three operating systems available on Travis CI, we have to deal with many issues:

• the Python language is only officialy supported on Linux Travis CI machines,
• Python environments use different executables names depending on the OS pointing alternatively to Python 3 or Python 2 executables,
• fetching a specific Python version is challenging: it depends on the OS version and installing a custom Python distribution depends on the packages management system.

To solve those problems, some directions have been taken:

• use python-build from Pyenv to install Python environment on Linux and macOS,
• use Chocolatey to install Python environment on Windows,
• use a Bash script because it is the shell commonly available on all operating systems available on Travis CI,
• use a Bash 3.2 compatible script because it is the one available on macOS,
• use pure Bash functions because external program may differ in behavior depending on the operating system type and version.

Development

The following dependencies are required:

• ShellCheck to lint shell scripts,
• Shellspec to run units tests,
• Bash to run the script,
• Pre-commit to check the changes before committing.

Contributing

If you're facing an issue using travis-python, please look at the existing tickets. Then you may open a new one.

You may also make a pull request to help improve it.

Changelog

See the changelog to see what changes have been made and what you can expect in the next release.

License

travis-python is licensed under the GNU GPL 3 or later.