Python exchangelib：检查项目是否为消息

Question

I got an error when retrieve items using exchangelib. Is there any method to detect whether the item is an email, and if not, just ignore it? The following code raises AttributeError: 'MeetingRequest' object has no attribute 'flag') since meeting requests don't have a flag field. Or is there any method to view the type of the item?

import re
import sys
from exchangelib import DELEGATE, IMPERSONATION, Account, Credentials, ServiceAccount, \
    EWSDateTime, EWSTimeZone, Configuration, NTLM, CalendarItem, Message, \
    Mailbox, Attendee, Q, ExtendedProperty, FileAttachment, ItemAttachment, \
    HTMLBody, Build, Version

from datetime import datetime, timedelta
import pytz

tz = EWSTimeZone.timezone('Asia/Hong_Kong')

creds = Credentials(
    username='domain\userID', 
    password='password')
)
account = Account(
    primary_smtp_address='myemail@domain',
    credentials=creds, 
    autodiscover=True, 
    access_type=DELEGATE)

class Flag(ExtendedProperty):
    property_tag = 0x1090
    property_type = 'Integer'

Message.register('flag', Flag)  


if(len(sys.argv) == 1):
    yesterday = tz.localize(EWSDateTime.now() - timedelta(days=3))
    today = tz.localize(EWSDateTime.now())
    fYear= yesterday.year
    fMonth= yesterday.month
    fDay= yesterday.day
    tYear = today.year
    tMonth = today.month
    tDay = today.day
elif(len(sys.argv) == 3):
    fromDate = sys.argv[1]
    toDate = sys.argv[2]
    fYear = fromDate[:4]
    fMonth = fromDate[4:6]
    fDay = fromDate[-2:]
    tYear = toDate[:4]
    tMonth = toDate[4:6]
    tDay = toDate[-2:]

for item in account.inbox.filter(datetime_received__range=(
    #tz.localize(EWSDateTime.now() - timedelta(days=1)),
    #tz.localize(EWSDateTime.now())
    tz.localize(EWSDateTime(int(fYear), int(fMonth), int(fDay))),
    tz.localize(EWSDateTime(int(tYear), int(tMonth), int(tDay)))
    )):
    subA=item.subject
    snd=item.sender.email_address
    fg=str(item.flag)
str(item.datetime_received.astimezone(pytz.timezone('Asia/Hong_Kong')).strftime("%a %b %d %H:%M:%S %Y"))
        rT = str(item.datetime_received.astimezone(pytz.timezone('Asia/Hong_Kong')).strftime("%Y-%m-%d %H:%M:%S"))
        cat=str(item.categories)
        if not subA:
            subA=""
            a="\"Inbox\",\""+snd+"\",\""+subA+"\",\""+rT+"\",\""+cat+"\",\""+fg+"\""
            print(a)
        else:
            subA = re.sub('\"\,\"', '\\"\,\\"', subA.rstrip())
            a="\"Inbox\",\""+snd+"\",\""+subA+"\",\""+rT+"\",\""+cat+"\",\""+fg+"\""
            decoded = a.encode('utf-8').decode('utf-8')
            print(decoded)

Answer 1

Just check the class of the returned item: if type(item) == Message and ignore the ones that don't match.

If you want to avoid the cause of the error, you need to also register the flag property on the MeetingRequest class (and MeetingResponse and MeetingCancellation if you have those in your folder).