Problem using icalendar to parse vDDDTypes data in python

Question content

As you can probably gather from the following, I am not a very skilled programmer. Nonetheless, I'm trying to write a python program for importing data from a icalendar format file and storing it in a database. The file appears multiple times as shown below (skipping irrelevant information):

begin:vevent
uid:tu1586072026
dtstamp:20240125t161430z
summary:my meeting
description:none
...
created:20231004t161313z
last-modified:20231023t162939z
end:vevent

My problem lies with the decoding of the last-modified value.

If I run:

print("dtstamp: " + str(component.get('dtstamp').dt))
    print("created: " + str(component.get('created').dt))
    print("modified: " + str(component.get('last-modified').dt))

Error after printing the first two in the correct way:

dtstamp: 2024-01-25 16:14:30+00:00
created: 2023-10-04 16:13:13+00:00

traceback (most recent call last):
  file "/usr/lib/python3.11/tkinter/__init__.py", line 1948, in __call__
    return self.func(*args)
           ^^^^^^^^^^^^^^^^
  file "/home/sailslack/coding/python/pim/cal_import.py", line 97, in ical_import
    print("modified: " + str(component.get('last-modified').dt))
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
attributeerror: 'nonetype' object has no attribute 'dt'

If I don't use the .dt attribute on the last line:

print("dtstamp: " + str(component.get('dtstamp').dt))
    print("created: " + str(component.get('created').dt))
    print("modified: " + str(component.get('last-modified')))

I don't get any errors, but:

dtstamp: 2024-01-25 16:14:30+00:00
    created: 2023-10-04 16:13:13+00:00
    modified: vDDDTypes(2023-10-23 16:29:39+00:00, Parameters({}))

Looks like I should be using the .dt property like the other properties.

What did i do wrong?

Correct answer

Update: This example works in my python environment and now uses a try block to handle missing components:

from icalendar import calendar
from datetime import datetime

with open('icalendar.ics', 'rb') as e:
    ecal = calendar.from_ical(e.read())
    for component in ecal.walk():
        if component.name == 'vevent':
            print(component.name)
            com_attr = ['created','dtstamp','last-modified']
            for timing in com_attr:
                try:
                    print(f"{timing}: {component.get(timing).dt}")
                except attributeerror:
                    print(f"{timing} -> does not exist!")
            com_text = ['uid','summary','description']
            for tex in com_text:
                try:
                    print(f"{tex}: {component.get(tex)}")                    
                except attributeerror:
                    print(f"{tex} -> does not exist!")

Output, e.g. last modified time is missing:

VEVENT
CREATED: 2023-10-04 16:13:13+00:00
DTSTAMP: 2024-01-25 16:14:30+00:00
LAST-MODIFIED -> does not exist!
UID: TU1586072026
SUMMARY: My meeting
DESCRIPTION: None

The above is the detailed content of Problem using icalendar to parse vDDDTypes data in python. For more information, please follow other related articles on the PHP Chinese website!