"Parsing" weird iCal timezones and converting them to standard timezones with GPT-3.5-turbo

aitz.py

# An iCal VTIMEZOME component looks like this:
#
# BEGIN:VTIMEZONE
# TZID:Romance Standard Time
# BEGIN:STANDARD
# DTSTART:16010101T030000
# TZOFFSETFROM:+0200
# TZOFFSETTO:+0100
# RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10
# END:STANDARD
# BEGIN:DAYLIGHT
# DTSTART:16010101T020000
# TZOFFSETFROM:+0100
# TZOFFSETTO:+0200
# RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3
# END:DAYLIGHT
# END:VTIMEZONE

vtimezones = {str(vtimezone.get('TZID')): vtimezone.to_ical().decode('utf-8') for vtimezone in cal.walk('VTIMEZONE')}
for vtimezone in cal.walk('VTIMEZONE'):
  cal.subcomponents.remove(vtimezone)

class TZMapping(BaseModel):
  ical_tz: str
  pytz_tz: str

class TZMappings(BaseModel):
  mappings: List[TZMapping]

result = ai.chat.completions.create(
  model="gpt-3.5-turbo",
  response_model=TZMappings,
  messages=[
    {
      "role": "system",
      "content": (
        "Inspect the provided iCal timezones and provide the corresponding pytz timezones. " +
        "Return a mapping from the key of the user-provided iCal timezone to the value of the corresponding pytz timezone.")
    },
    {
      "role": "user",
      "content": json.dumps(vtimezones)
    }
  ]
)

tzmap = {tzm.ical_tz: tzm.pytz_tz for tzm in result.mappings}

# tzmap looks like this:
# {'Romance Standard Time': 'Europe/Paris', ...}