Python 如何自动筛选电子邮件附件中的最新文件

我有一些代码可以使用MIME模块从电子邮件中附加文件 但是，每次我发送电子邮件时，我都希望它自动发送 仅文件中的前5张最新图片

  import os, re
        import sys
        import smtplib

        from email.mime.image import MIMEImage
        from email.mime.multipart import MIMEMultipart
        from email.mime.text import MIMEText

        SMTP_SERVER = 'smtp.gmail.com'
        SMTP_PORT = 587

        sender = '***@gmail.com'
        password = "*******"
        recipient = '***@gmail.com'
        subject = 'Python emaillib Test'
        message = 'Images attached.'

        directory = "images/"

        def main():
            msg = MIMEMultipart()
            msg['Subject'] = 'Python emaillib Test'
            msg['To'] = recipient
            msg['From'] = sender
         #this is where it searches for the image
            files = os.listdir(directory)
            jpgsearch = re.compile(".jpg", re.IGNORECASE)
            files = filter(jpgsearch.search, files)
            for filename in files:
                path = os.path.join(directory, filename)
                if not os.path.isfile(path):
                    continue

                img = MIMEImage(open(path, 'rb').read(), _subtype="jpg")
                img.add_header('Content-Disposition', 'attachment', filename = filename)
                msg.attach(img)

            part = MIMEText('text', "plain")
            part.set_payload(message)
            msg.attach(part)

            session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)

            session.ehlo()
            session.starttls()
            session.ehlo
            session.login(sender, password)

            session.sendmail(sender, recipient, msg.as_string())
            session.quit()

        if __name__ == '__main__':
            main()

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我是Python的初学者，希望您能帮助我获取atime、ctime或mtime。然后简单地比较时间戳（或者使用基于datetime.datetime.fromtimestamp的其他逻辑）

您能用我前面的代码给出一个例子吗。因为我是初学者？Python有os.atime、os.ctime和os.mtime。我应该将os.atime、os.ctime和os.mtime放在我的代码中的什么位置？谢谢你的帮助！