我有一个错误，TypeError：预期的类似字节的对象，而不是 NoneType。错误来自：encoders.encode_base64(eml_atch) line 56。
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email.utils import COMMASPACE, formatdate
from email import encoders
import os,datetime
CRLF = "\r\n"
login = "my@email.com"
password = "mypassword"
attendees = ["attendees1@gmail.com", "attendees2@gmail.com","attendees3@gmail.com"]
organizer = "ORGANIZER;CN=organiser:mailto:first"+CRLF+" @ada-asia.com"
fro = "Fahim Maula <fahim.maula@ada-asia.com>"
ddtstart = datetime.datetime.now()
dtoff = datetime.timedelta(days = 1)
dur = datetime.timedelta(hours = 1)
ddtstart = ddtstart +dtoff
dtend = ddtstart + dur
dtstamp = datetime.datetime.now().strftime("%Y%m%dT%H%M%SZ")
dtstart = ddtstart.strftime("%Y%m%dT%H%M%SZ")
dtend …