Gmail API cannot get email data

问题

I am trying to print my email messages using the gmail API:

results = service.users().messages().list(userId='me',labelIds = ['INBOX']).execute()

messages = results.get('messages', [])

if not messages:
    print("No messages found.")
else:
    count = 0 
    for message in messages:
        count += 1

        msg = service.users().messages().get(userId='me', id=message['id']).execute()

        full_msg = base64.urlsafe_b64decode(msg['payload']['body']['data'].encode("ASCII")).decode("utf-8")
        print("Email {}: {}".format(count, full_msg))

It prints the first email properly, but on the second for loop I get a KeyError for 'data'. If I try to print the snippet of each email by doing print(msg['snippet']), it works fine.

回答1:

msg['payload']['body']['data'] returns you the email attachment, but not every message has an attachment.

---

• If you want to retrieve the attachment where it exists - implement a conditional statement to verify either msg['payload']['body']['size'] is not equal to 0 before proceeding with decoding and printing
• If you want retrieve the message body content instead of the attachment, you can do it as specified in the documentation

来源：https://stackoverflow.com/questions/61839869/gmail-api-cannot-get-email-data