def main():
    all_args = args()
    user_vars_file = all_args['file']
    user_vars_file = os.path.abspath(
        os.path.expanduser(
            user_vars_file
        )
    )

    with open(user_vars_file, 'rb') as f:
        user_vars = yaml.safe_load(f.read())

    if not user_vars:
        raise SystemExit(
            'FAIL: The variable file provided [ %s ] is empty.'
            % user_vars_file
        )

    changed = False
    generator = CredentialGenerator()
    for entry, value in user_vars.iteritems():
        if value is None or all_args['regen'] is True:
            if entry.endswith('password') or entry.endswith('secret'):
                changed = True
                user_vars[entry] = generator.generator(pw_type='password')
            elif entry.endswith('token'):
                changed = True
                user_vars[entry] = generator.generator(pw_type='token')
            elif entry.endswith('key'):
                changed = True
                user_vars[entry] = generator.generator(pw_type='key')
            elif entry.endswith('uuid'):
                changed = True
                user_vars[entry] = str(uuid.uuid4())
            elif entry.startswith('swift_hash_path'):
                changed = True
                user_vars[entry] = generator.generator(pw_type='key')

    # If changed is set to True, this will archive the old passwords
    if changed is True:
        user_vars_tar_file = '%s.tar' % user_vars_file
        print('Creating backup file [ %s ]' % user_vars_tar_file)
        # Create a tarball if needed
        with tarfile.open(user_vars_tar_file, 'a') as tar:
            os.chmod(user_vars_tar_file, 0o600)
            basename = os.path.basename(user_vars_file)
            # Time stamp the password file in UTC
            utctime = datetime.datetime.utcnow()
            utctime = utctime.strftime('%Y%m%d_%H%M%S')
            backup_name = '%s-%s' % (basename, utctime)
            tar.add(user_vars_file, arcname=backup_name)

    with open(user_vars_file, 'wb') as f:
        os.chmod(user_vars_file, 0o600)
        f.write(
            yaml.safe_dump(
                user_vars,
                default_flow_style=False,
                width=1000
            )
        )

    print('Operation Complete, [ %s ] is ready' % user_vars_file)
Calculate the loglikelihood for each observation associated with the
dataset/ETHPy150Open openstack/openstack-ansible/scripts/pw-token-gen.py/main--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/statespace/kalman_filter.py/KalmanFilter.loglikeobs