Timezone Information Missing in pytz?

Question

I\'m having a very weird problem with Python\'s pytz: it seems to have an incomplete catalog of timezones on my system (MacOS X 10.8.5, system Python 2.7.5).

Answer 1

Tried reinstall, but bug not gone.

Then, I open pytz/__init__.py, add a line zone = 'UTC', problem is gone:

zone = _unmunge_zone(zone)
zone = 'UTC'
if zone not in _tzinfo_cache:
    if zone in all_timezones_set:
        fp = open_resource(zone)
        try:
            _tzinfo_cache[zone] = build_tzinfo(zone, fp)
        finally:
            fp.close()
    else:
        raise UnknownTimeZoneError(zone)

This is quick and simple solution, but you'd better find the real problem( version? system? ) if you have time.