def _get_timezone(self, tz):
<EOL>if tz == "<STR_LIT>":<EOL><INDENT>try:<EOL><INDENT>return tzlocal.get_localzone()<EOL><DEDENT>except pytz.UnknownTimeZoneError:<EOL><INDENT>return "<STR_LIT:?>"<EOL><DEDENT><DEDENT>if len(tz) == <NUM_LIT:2>:<EOL><INDENT>try:<EOL><INDENT>zones = pytz.country_timezones(tz)<EOL><DEDENT>except KeyError:<EOL><INDENT>return "<STR_LIT:?>"<EOL><DEDENT>tz = zones[<NUM_LIT:0>]<EOL><DEDENT>try:<EOL><INDENT>zone = pytz.timezone(tz)<EOL><DEDENT>except pytz.UnknownTimeZoneError:<EOL><INDENT>return "<STR_LIT:?>"<EOL><DEDENT>return zone<EOL>
Find and return the time zone if possible