How to use the dateparser.timezone_parser.StaticTzInfo function in dateparser

def test_localize_raises_error_if_date_has_tzinfo(self, given_date):
        self.timezone_info = StaticTzInfo('UTC\\+00:00', timedelta(0))
        self.when_date_is_localized(given_date)
        self.then_error_was_raised(ValueError, ['Not naive datetime (tzinfo is already set)'])

              tzinfo=StaticTzInfo('Z', timedelta(0))))
    ])
    def test_parse_timestamp(self, date_string, expected):
        self.given_local_tz_offset(0)
        self.given_parser(settings={'TO_TIMEZONE': 'UTC'})
        self.when_date_is_parsed(date_string)
        self.then_date_obj_exactly_is(expected)

def apply_dateparser_timezone(utc_datetime, offset_or_timezone_abb):
    for name, info in _tz_offsets:
        if info['regex'].search(' %s' % offset_or_timezone_abb):
            tz = StaticTzInfo(name, info['offset'])
            return utc_datetime.astimezone(tz)

def localize_timezone(date_time, tz_string):
    if date_time.tzinfo:
        return date_time

    tz = None

    try:
        tz = timezone(tz_string)
    except UnknownTimeZoneError as e:
        for name, info in _tz_offsets:
            if info['regex'].search(' %s' % tz_string):
                tz = StaticTzInfo(name, info['offset'])
                break
        else:
            raise e

    return tz.localize(date_time)

def apply_dateparser_timezone(utc_datetime, offset_or_timezone_abb):
    for name, info in _tz_offsets:
        if info['regex'].search(' %s' % offset_or_timezone_abb):
            tz = StaticTzInfo(name, info['offset'])
            return utc_datetime.astimezone(tz)

def pop_tz_offset_from_string(date_string, as_offset=True):
    if _search_regex_ignorecase.search(date_string):
        for name, info in _tz_offsets:
            timezone_re = info['regex']
            timezone_match = timezone_re.search(date_string)
            if timezone_match:
                start, stop = timezone_match.span()
                date_string = date_string[:start + 1] + date_string[stop:]
                return (
                    date_string,
                    StaticTzInfo(name, info['offset']) if as_offset else name)
    return date_string, None