rename_ical.py

import icalendar

def rename_events(infile, outfile, names=None):
    '''
    Given a path to a ics file, rename each event and write to outfile.
    
    names should be a list of strings where each item is the new name 
    to assign to each event in the ics file. If an insuffient number
    of names are provided, then an error will occur.
    
    If no names are provided, then the user is asked to provide a name
    for each event from the command line. An empty response for an event
    results in the existing name being preserved.
    '''
    # Read input file
    with open(infile, 'rb') as f:
        cal = icalendar.Calendar.from_ical(f.read())
    if names:
        # Use the provided names
        for i, event in enumerate(cal.walk(name='VEVENT')):
            event['summary'] = names[i]
    else:
        # Get names from user
        for event in cal.walk(name='VEVENT'):
            name = input(f'New Event Name ({event["summary"]}): ')
            if name.strip():
                event['summary'] = name
    # write output file
    with open(outfile, 'wb') as f:
        f.write(cal.to_ical())

if __name__ == '__main__':
    #rename_events('example.ics', 'modified.ics', names=['Modified Event'])
    rename_events('example.ics', 'manual.ics')