message: Use python as base vm image for Travis CI Ubuntu 18.04
  (By default Travis CI uses Ruby)
diff: @@ -50,9 +50,15 @@ matrix:
  script:
  - bazel test --show_progress=no --spawn_strategy standalone -s --verbose_failures --test_output=errors -- //tensorflow_io/... -//tensorflow_io/video:video_py_test
  - name: "Ubuntu 18.04 Python 2.7"
  + language: python
  + python:
  + - 2.7
  script:
  - docker run -i -t -e PYTHON_VERSION= -e BAZEL_VERSION=0.20.0 -e BAZEL_OS=linux --rm -v $PWD:/workspace -w /workspace --net=host ubuntu:18.04 bash -x -c ".travis/python.ubuntu.18.04.sh && apt-get -y -qq install libavformat57 libavcodec57 libavutil55 libswscale4 && bazel test --spawn_strategy standalone -s --verbose_failures -- //tensorflow_io/... -//tensorflow_io/ignite:ignite_py_test"
  - name: "Ubuntu 18.04 Python 3.6"
  + language: python
  + python:
  + - 3.6
  script:
  - docker run -i -t -e PYTHON_VERSION=3 -e BAZEL_VERSION=0.20.0 -e BAZEL_OS=linux --rm -v $PWD:/workspace -w /workspace --net=host ubuntu:18.04 bash -x -c ".travis/python.ubuntu.18.04.sh && apt-get -y -qq install libavformat57 libavcodec57 libavutil55 libswscale4 && bazel test --spawn_strategy standalone -s --verbose_failures -- //tensorflow_io/... -//tensorflow_io/ignite:ignite_py_test"
  - name: "Ubuntu 14.04 R 3.2"
  