Listing 2. dynamic-calendar.py, a program that generates a calendar
in iCalendar format.

#!/usr/bin/python

# Grab the CGI module
import cgi
from iCalendar import Calendar, Event
from datetime import datetime
from iCalendar import UTC # timezone

# Log any problems that we might have
import cgitb
cgitb.enable(display=0, logdir="/tmp")

# Send a content-type header to the user's browser
print "Content-type: text/calendar\n\n"

# Create a calendar object
cal = Calendar()

# What product created the calendar?
cal.add('prodid',
        '-//Python iCalendar 0.9.3//mxm.dk//')

# Version 2.0 corresponds to RFC 2445
cal.add('version', '2.0')

# Create one event
event = Event()
event.add('summary', 'ATF deadline')
event.add('dtstart',
          datetime(2005,3,11,8,0,0,tzinfo=UTC()))
event.add('dtend',
          datetime(2005,3,11,10,0,0,tzinfo=UTC()))
event.add('dtstamp',
          datetime(2005,3,11,0,10,0,tzinfo=UTC()))
event['uid'] = 'ATF20050311A@lerner.co.il'

# Give this very high priority!
event.add('priority', 5)

# Add the event to the calendar
cal.add_component(event)

# Ask the calendar to render itself as an iCalendar
# file, and return that file in an HTTP response!
print cal.as_string()