def check_requirements()

in noxfile.py [0:0]


def check_requirements(session):
    session.install(REPO_TOOLS_REQ)

    if 'update' in session.posargs:
        command = 'update-requirements'
    else:
        command = 'check-requirements'

    for reqfile in glob('**/requirements*.txt'):
        session.run('gcp-devrel-py-tools', command, reqfile)