Python 2 and 3 compatibility function that converts a string to Unicode. In case of Unicode, the string is returned
    unchanged
    :param string: input string
    :return: Unicode string

def make_unicode(string):
    """
    Python 2 and 3 compatibility function that converts a string to Unicode. In case of Unicode, the string is returned
    unchanged
    :param string: input string
    :return: Unicode string
    """
    if sys.version < '3' and isinstance(string, str):
        return unicode(string.decode('utf-8'))

    return string