csv['Date of Expiry'] = pd.to_datetime(csv['Date of Expiry'], errors='coerce') today_date = pd.datetime.today().date() csv2 = (csv['Date of Expiry'].dt.date - today_date).astype('timedelta64[D]') def send_me_email(): server = smtplib.SMTP('Outlook.Office365.com', 587) server.ehlo() server.starttls() server.ehlo() server.login('XXX.XXXXXXX@XXX.com', 'XXXXXXXXXX') msg = "Please consider changing your password, it will expire in two days" server.sendmail("XXX.XXXXXXX@XXX.com", csv['Email id'], msg) server.quit() 上面的代码运行良好, 但当我试图用下面的代码遍历文件中的所有用户时:

for k in csv:
    if csv2 <= 2.0:
        csv['Email id'].apply(send_me_email())
   我得到以下错误:
  
ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
   请告诉我哪里出错了