Return list of Robot Framework -compatible cli-variables parsed
    from ROBOT_-prefixed environment variable

def get_robot_variables():
    """Return list of Robot Framework -compatible cli-variables parsed
    from ROBOT_-prefixed environment variable

    """
    prefix = 'ROBOT_'
    variables = []

    def safe_str(s):
        if isinstance(s, six.text_type):
            return s
        else:
            return six.text_type(s, 'utf-8', 'ignore')
    for key in os.environ:
        if key.startswith(prefix) and len(key) > len(prefix):
            variables.append(safe_str(
                '%s:%s' % (key[len(prefix):], os.environ[key]),
            ))
    return variables