.travis.yml

os: linux
dist: focal
language: python            # this works for Linux but is an error on macOS or Windows
jobs:
  include:
    - name: "Python 3.8.3 on Linux"
      python: 3.8
    - name: "Python 3.8.5 on macOS"
      os: osx
      osx_image: xcode12    # Python 3.8.2 running on macOS 10.15.6
      language: shell       # 'language: python' is an error on Travis CI macOS
      # python: 3.8         # 'python:' is ignored on Travis CI macOS
      before_install: python3 --version ; pip3 --version ; sw_vers
    - name: "Python 3.8.5 on Windows"
      os: windows           # Windows 10.0.17134 N/A Build 17134
      language: shell       # 'language: python' is an error on Travis CI Windows
      # python: 3.8         # 'python:' is ignored on Travis CI Windows
      env:  PATH=/c/Python38:/c/Python38/Scripts:$PATH
      before_install:
        - choco install python --version 3.8.5  # this install takes at least 1 min 30 sec

install:
  - ./.travis/install.sh

script:
  - python --version
  - codespell . --ignore-words-list=hist,ba --quiet-level=2
  - flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
  - pytest

before_deploy:
  - ./.travis/build_binaries.sh

deploy:
  provider: releases
  token: $RELEASE_TOKEN
  skip_cleanup: true
  file_glob: true
  file: 
    - dist/kb_*
  on:
    tags: true
  name: $TRAVIS_TAG