[Python] How to use the python icalendar.cal.Timezone class to create an icalendar VTIMEZONE

Can someone give me an example of generating a VTIMEZONE section of an icalendar file using the python icalendar library?

I believe this can be done by using the icalendar.cal.Timezone Component class, but don't yet know exactly how.

Preferably, the resulting portion of the icalendar file would be similar to this exported sample from the Mac OS X ICal program (or be analogous, but still valid icalendar format).

BEGIN:VTIMEZONE
TZID:America/Denver
BEGINAYLIGHT
TZOFFSETFROM:-0700
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
DTSTART:20070311T020000
TZNAME:MDT
TZOFFSETTO:-0600
ENDAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0600
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
DTSTART:20071104T020000
TZNAME:MST
TZOFFSETTO:-0700
END:STANDARD
END:VTIMEZONE


So far I have this working code, but it doesn't include the needed STANDARD and DAYLIGHT VTIMEZONE elements.

import icalendar
timezone = icalendar.cal.Timezone()
timezone.add('TZID', 'America/Denver')
timezone.to_ical()

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