Extract Sender address email from MeetingItems/ReportItems

I'm trying to write a program that finds my e-mails. I'm having trouble writing a function that would return the sender's email address. Whatever type of message it is.I find function:

def return_sender(msg):    if msg.Class == 43        if msg.SenderEmailType == "EX":            if msg.Sender.GetExchangeUser() != None:                return msg.Sender.GetExchangeUser().PrimarySmtpAddress            else:                return msg.Sender.GetExchangeDistributionList().PrimarySmtpAddress        else:            return msg.SenderEmailAddress

Class 43 is MailItem, but for example how to get the sender's address from class 53 = MeetingItem?

msg.Sender

It returns AttributeError.

msg.SenderEmailAddress

It returns:

/O=EXCHANGELABS/OU=EXCHANGEADMINISTRATIVEGROUP(FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=6F467C825619482293F429C0BDE6F1DB-

Is there any way to get the sender from a message type other than MailItem? And how you can check outlook what type of message isThank you