How to use the nox.session function in nox

@nox.session(python=["2.7", "3.5", "3.6", "3.7"])
def unit(session):
    """Run the unit test suite."""
    default(session)

@nox.session(python='python3.8')
def test(session):
    """Run all the tests."""
    session.install('-rrequirements-dev.txt')
    session.install('-e', '.')
    run_pytest(session)

@nox.session(python=python)
def publish(session):
    print("REMINDER: Has the changelog been updated?")
    session.run("rm", "-rf", "dist", "build", external=True)
    publish_deps = ["setuptools", "wheel", "twine"]
    session.install(*publish_deps)
    session.run("make", "build_frontend", external=True)
    session.run("python", "setup.py", "--quiet", "sdist", "bdist_wheel")
    session.run("python", "-m", "twine", "upload", "dist/*")
    publish_docs(session)

@nox.session(python="3.7")
def lint_setup_py(session):
    """Verify that setup.py is valid (including RST check)."""
    session.install("docutils", "pygments")
    session.run("python", "setup.py", "check", "--restructuredtext", "--strict")

@nox.session(python="3.7")
def lint(session):
    """Run linters.

    Returns a failure if the linters find linting errors or sufficiently
    serious code quality issues.
    """
    session.install("flake8", BLACK_VERSION, *LOCAL_DEPS)
    session.run("black", "--check", *BLACK_PATHS)
    session.run("flake8", "google", "tests")

@nox.session(python="3.7")
def lint(session):
    """Run linters.

    Returns a failure if the linters find linting errors or sufficiently
    serious code quality issues.
    """
    session.install("flake8", "black", *LOCAL_DEPS)
    session.run(
        "black",
        "--check",
        "google",
        "tests",
        "docs",
    )
    session.run("flake8", "google", "tests")

@nox.session(python='3.9')
def bundle(session):
    """Bundle the distribution."""
    session.install('-e', '.', 'pyinstaller')
    session.run('rm', '-rf', 'build', 'dist', 'py-terraform-provider-b2.egg-info', external=True)
    session.run('pyinstaller', '--onefile', 'py-terraform-provider-b2.spec')

    # Set outputs for GitHub Actions
    if CI:
        asset_path = glob('dist/*')[0]
        print('::set-output name=asset_path::', asset_path, sep='')

        name, ext = os.path.splitext(os.path.basename(asset_path))
        system = platform.system().lower()
        asset_name = '{}-{}{}'.format(name, system, ext)
        print('::set-output name=asset_name::', asset_name, sep='')

@nox.session(python=_PYTHON_VERSIONS)
@nox.parametrize('coverage', [False, True])
def runtests(session, coverage):
    '''
    runtests.py session with zeromq transport and default crypto
    '''
    session.notify(
        'runtests-parametrized-{}(coverage={}, crypto=None, transport=\'zeromq\')'.format(
            session.python,
            coverage
        )

@nox.session(python="3.6")
def docs(session):
    # RTD uses pip for managing dependencies, so we mirror that approach
    session.install(".")
    session.install("-r", "docs/requirements.txt")
    session.run(
        "sphinx-build",
        "-b",
        "html",
        "docs",
        "docs/_build",
        "-W",
        env={"TAMR_CLIENT_BETA": "1", "TAMR_CLIENT_DOCS": "1"},
    )

@nox.session(python='3.6')
def cover(session):
    """Run the final coverage report.

    This outputs the coverage report aggregating coverage from the unit
    test runs (not system test runs), and then erases coverage data.
    """
    session.install('coverage', 'pytest-cov')
    session.run('coverage', 'report', '--show-missing', '--fail-under=100')
    session.run('coverage', 'erase')