Gmail Api message body (text)

def getText(service, userId, msg_id):
    message = gmail_service.users().messages().get(userId='me', id=msg_id, format='full').execute()
    text = message.get('payload').get('parts')[0].get('body').get('data')

    if text:
        return base64.urlsafe_b64decode(text.encode('ASCII')).decode('utf-8')

    return message['snippet']