.travis.yml

language: python

matrix:
    include:
        - name: "Python 2.7 on Windows"
          os: windows           # Windows 10.0.17134 N/A Build 17134
          language: shell       # 'language: python' is an error on Travis CI Windows
          # python: 2.7.18         # 'python:' is ignored on Travis CI Windows
          before_install:
            # https://travis-ci.community/t/windows-python-pip-module-not-found/5480/4
            - choco install python2
            - python -m pip install --upgrade pip
            - python -m pip install pywin32
          env:
            - PATH=/c/Python27:/c/Python27/Scripts:$PATH
            - TOXENV=py27

        - name: "Python 3.7.5 on Windows"
          os: windows           # Windows 10.0.17134 N/A Build 17134
          language: shell       # 'language: python' is an error on Travis CI Windows
          # python: 3.7         # 'python:' is ignored on Travis CI Windows
          before_install:
            # https://travis-ci.community/t/windows-python-pip-module-not-found/5480/4
            - choco install python  --version 3.7.5
            - python -m pip install --upgrade pip
            - python -m pip install pywin32
          env:
            - PATH=/c/Python37:/c/Python37/Scripts:$PATH
            - TOXENV=py37

install:
    - travis_retry pip install virtualenv tox

script:
    - travis_retry tox