运行日历 api python3 时出现“NoneType”错误

Question

I'm working on python script which captures all my events in google calendar. this code will show the list of all the events in a day.

Below is the code.

from __future__ import print_function
import httplib2
import os
import datetime

from apiclient import discovery
import oauth2client
from oauth2client import client
from oauth2client import tools
from oauth2client.file import Storage

import datetime

try:
    import argparse
    flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
    flags = None

# If modifying these scopes, delete your previously saved credentials
# at ~/.credentials/calendar-python-quickstart.json
SCOPES = 'https://www.googleapis.com/auth/calendar.readonly'
CLIENT_SECRET_FILE = 'credentials.json'
APPLICATION_NAME = 'Google Calendar API Python Quickstart'


def get_credentials():
    """Gets valid user credentials from storage.
    If nothing has been stored, or if the stored credentials are invalid,
    the OAuth2 flow is completed to obtain the new credentials.
    Returns:
        Credentials, the obtained credential.
    """
    home_dir = os.path.expanduser('~')
    credential_dir = os.path.join(home_dir, '.credentials')
    if not os.path.exists(credential_dir):
        os.makedirs(credential_dir)
    credential_path = os.path.join(credential_dir,
                                   'calendar-python-quickstart.json')

    store = oauth2client.file.Storage(credential_path)
    credentials = store.get()
    if not credentials or credentials.invalid:
        flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
        flow.user_agent = APPLICATION_NAME
        if flags:
            credentials = tools.run_flow(flow, store, flags)
        else: # Needed only for compatibility with Python 2.6
            credentials = tools.run(flow, store)
        print('Storing credentials to ' + credential_path)
    return credentials

def main():
    """Shows basic usage of the Google Calendar API.
    Creates a Google Calendar API service object and outputs a list of the next
    10 events on the user's calendar.
    """
    credentials = get_credentials()
    http = credentials.authorize(httplib2.Http())
    service = discovery.build('calendar', 'v3', http=http)

    now = datetime.datetime.utcnow().isoformat() + 'Z' # 'Z' indicates UTC time
    print('Getting the upcoming 10 events')
    eventsResult = service.events().list(
        calendarId='primary', timeMin=now, maxResults=10, singleEvents=True,
        orderBy='startTime').execute()
    events = eventsResult.get('items', [])

    if not events:
        print('No upcoming events found.')
    for event in events:
        start = event['start'].get('dateTime')
#        print(start)
        start = start[:-9]

#        print(start)
        start = datetime.datetime.strptime(start,"%Y-%m-%dT%H:%M")

        pretty_time = start.strftime("%I:%M")
        pretty_date = start.strftime("%B %d, %Y")
                
        print(event['summary'],"at",pretty_time,"on",pretty_date)


if __name__ == '__main__':
    main()
    

below is the error which I'm getting. Not able to find the what is the mistake I made. please help.

below is the error which I'm getting. Not able to find the what is the mistake I made. please help.

Traceback (most recent call last):
  File "/Users/mbhamidipati/python-practice/change/getevents.py", line 86, in <module>
    main()
  File "/Users/mbhamidipati/python-practice/change/getevents.py", line 75, in main
    start = start[:-9]
TypeError: 'NoneType' object is not subscriptable

Thanks, Sreman

Answer 1

It seems that the main thing you need to decide is how you're going to handle when

event['start'].get('dateTime') returns None

you can add a default value to .get('dateTime')

Something like this, assuming that you can get a value from another key, such as 'date'

start = event['start'].get('dateTime', event['start'].get('date'))