code: def generate_travis_yml():
    
    def get_mustache_file(file_name):
      return pkg_resources.resource_string(__name__, file_name).decode('utf-8')
  
    template = get_mustache_file('travis.yml.mustache')
    before_install_linux = get_mustache_file('before_install_linux.mustache')
    before_install_osx = get_mustache_file('before_install_osx.mustache')
    env_osx_with_pyenv = get_mustache_file('env_osx_with_pyenv.mustache')
    docker_build_image = get_mustache_file('docker_build_image.mustache')
    docker_run_image = get_mustache_file('docker_run_image.mustache')
  
    context = {
      'header': HEADER,
      'integration_shards': range(0, num_integration_shards),
      'integration_shards_length': num_integration_shards,
    }
    renderer = pystache.Renderer(partials={
      'before_install_linux': before_install_linux,
      'before_install_osx': before_install_osx,
      'env_osx_with_pyenv': env_osx_with_pyenv,
      'docker_build_image': docker_build_image,
      'docker_run_image': docker_run_image
    })
    print(renderer.render(template, context))
docs: Generates content for a .travis.yml file from templates.