How to use the arrow.parser.TzinfoParser.parse function in arrow

def _get_tzinfo(tz_expr):

        if tz_expr is None:
            return dateutil_tz.tzutc()
        if isinstance(tz_expr, tzinfo):
            return tz_expr
        else:
            try:
                return parser.TzinfoParser.parse(tz_expr)
            except parser.ParserError:
                raise ValueError('\'{0}\' not recognized as a timezone'.format(
                    tz_expr))

>>> utc.to(tz.tzlocal())
            

            >>> utc.to('-07:00')
            

            >>> utc.to('local')
            

            >>> utc.to('local').to('utc')
            

        '''

        if not isinstance(tz, tzinfo):
            tz = parser.TzinfoParser.parse(tz)

        dt = self._datetime.astimezone(tz)

        return self.__class__(dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
            dt.microsecond, dt.tzinfo)

>>> utc.to(tz.tzlocal())
            

            >>> utc.to('-07:00')
            

            >>> utc.to('local')
            

            >>> utc.to('local').to('utc')
            

        '''

        if not isinstance(tz, tzinfo):
            tz = parser.TzinfoParser.parse(tz)

        dt = self._datetime.astimezone(tz)

        return self.__class__(dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
            dt.microsecond, dt.tzinfo)

def __init__(self, year, month, day, hour=0, minute=0, second=0, microsecond=0,
                 tzinfo=None):

        if util.isstr(tzinfo):
            tzinfo = parser.TzinfoParser.parse(tzinfo)
        tzinfo = tzinfo or dateutil_tz.tzutc()

        self._datetime = datetime(year, month, day, hour, minute, second,
            microsecond, tzinfo)

>>> arrow.now('US/Pacific')
            

            >>> arrow.now('+02:00')
            

            >>> arrow.now('local')
            
        '''

        if tz is None:
            tz = dateutil_tz.tzlocal()
        elif not isinstance(tz, tzinfo):
            tz = parser.TzinfoParser.parse(tz)

        return self.type.now(tz)

>>> utc.to(tz.tzlocal())
            

            >>> utc.to('-07:00')
            

            >>> utc.to('local')
            

            >>> utc.to('local').to('utc')
            

        '''

        if not isinstance(tz, tzinfo):
            tz = parser.TzinfoParser.parse(tz)

        dt = self._datetime.astimezone(tz)

        return self.__class__(dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
            dt.microsecond, dt.tzinfo)

def __init__(self, year, month, day, hour=0, minute=0, second=0, microsecond=0,
                 tzinfo=None):

        if util.isstr(tzinfo):
            tzinfo = parser.TzinfoParser.parse(tzinfo)
        tzinfo = tzinfo or dateutil_tz.tzutc()

        self._datetime = datetime(year, month, day, hour, minute, second,
            microsecond, tzinfo)

rounding = int(value[5]) % 2
            elif seventh_digit > 5:
                rounding = 1
            else:
                rounding = 0

            parts["microsecond"] = int(value[:6]) + rounding

        elif token == "X":
            parts["timestamp"] = float(value)

        elif token == "x":
            parts["expanded_timestamp"] = int(value)

        elif token in ["ZZZ", "ZZ", "Z"]:
            parts["tzinfo"] = TzinfoParser.parse(value)

        elif token in ["a", "A"]:
            if value in (self.locale.meridians["am"], self.locale.meridians["AM"]):
                parts["am_pm"] = "am"
            elif value in (self.locale.meridians["pm"], self.locale.meridians["PM"]):
                parts["am_pm"] = "pm"