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Parsing files (ics/ icalendar) using Python

Answer 1

A:

You could use a regex:

import re
text = #your text
print re.search("SUMMARY:.*?:", text, re.DOTALL).group()
print re.search("DESCRIPTION:.*?:", text, re.DOTALL).group()
print re.search("DTSTAMP:.*:?", text, re.DOTALL).group()

I'm sure it may be possible to skip the first and last words, I'm just not sure how to do it with regex. You could do it this way though:

print ' '.join(re.search("SUMMARY:.*?:", text, re.DOTALL).group().replace(':', ' ').split()[1:-1]

Wayne Werner 2010-08-04 17:44:02

Answer 2

A:

I'd parse line by line and do a search for your terms, then get the index and extract that and X number of characters further (however many you think you'll need). Then parse that much smaller string to get it to be what you need.

Brian 2010-08-04 17:47:18

Answer 3

+3 A:

The icalendar package looks nice.

For instance, to write a file:

from icalendar import Calendar, Event
from datetime import datetime
from icalendar import UTC # timezone

cal = Calendar()
cal.add('prodid', '-//My calendar product//mxm.dk//')
cal.add('version', '2.0')

event = Event()
event.add('summary', 'Python meeting about calendaring')
event.add('dtstart', datetime(2005,4,4,8,0,0,tzinfo=UTC))
event.add('dtend', datetime(2005,4,4,10,0,0,tzinfo=UTC))
event.add('dtstamp', datetime(2005,4,4,0,10,0,tzinfo=UTC))
event['uid'] = '20050115T101010/[email protected]'
event.add('priority', 5)

cal.add_component(event)

f = open('example.ics', 'wb')
f.write(cal.as_string())
f.close()

Tadaaa, you get this file:

BEGIN:VCALENDAR
PRODID:-//My calendar product//mxm.dk//
VERSION:2.0
BEGIN:VEVENT
DTEND;VALUE=DATE:20050404T100000Z
DTSTAMP;VALUE=DATE:20050404T001000Z
DTSTART;VALUE=DATE:20050404T080000Z
PRIORITY:5
SUMMARY:Python meeting about calendaring
UID:20050115T101010/[email protected]
END:VEVENT
END:VCALENDAR

But what lies in this file?

g = open('example.ics','rb')
gcal = Calendar.from_string(g.read())
for component in gcal.walk():
    print component.name
g.close()

You can see it easily:

>>> 
VCALENDAR
VEVENT
>>>

What about parsing the data about the events:

g = open('example.ics','rb')
gcal = Calendar.from_string(g.read())
for component in gcal.walk():
    if component.name == "VEVENT":
        print component.get('summary')
        print component.get('dtstart')
        print component.get('dtend')
        print component.get('dtstamp')
g.close()

Now, you can read:

>>> 
Python meeting about calendaring
20050404T080000Z
20050404T100000Z
20050404T001000Z
>>>

wok 2010-08-04 18:17:47

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Parsing files (ics/ icalendar) using Python

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