添加 "retry" 导致我丢失了回溯

Question

目前我有一个这样定义的脚本：

import traceback
import logging
import time

logging.basicConfig(level=loggings.DEBUG)
logger=logging.getLogger(__name__)

if __name__ == '__main__':
    try:
        main_code()
    except Exception as e:
        logger.debug(traceback.format_exc())
        error = traceback.format_exc()
        with smtplib.SMTP("mailhub.global.company.com") as mailServer:
            msg = MIMEMultipart('related')
            msg['Subject'] = Header(u'Test', 'utf-8')
            msg['X-Priority'] = '2'
            body = "Delivery Failure, the following exception occurred:\n\n" + str(error)
            msg.attach(MIMEText(body, 'plain'))
            mailServer.sendmail("email@gmail.com", ["email@gmail.com"], msg.as_string()) 
            mailServer.quit()
        print("Exception occurred- delivery failure email sent")

如果有错误，我会收到一封带有回溯的电子邮件。

我试图在代码中添加一个 "retry" 以防失败，这样它会尝试 5 次，中间间隔 5 秒，如下所示：

if __name__ == '__main__':
    for attempt in range(5):
        try:
            main_code()
        except Exception as e:
            print("Error occurred, retrying in 5 seconds!")
            time.sleep(5)
            continue
        else:
            break
    else:
        logger.debug(traceback.format_exc())
        error = traceback.format_exc()
        with smtplib.SMTP("mailhub.global.company.com") as mailServer:
            msg = MIMEMultipart('related')
            msg['Subject'] = Header(u'Test', 'utf-8')
            msg['X-Priority'] = '2'
            body = "Delivery Failure, the following exception occurred:\n\n" + str(error)
            msg.attach(MIMEText(body, 'plain'))
            mailServer.sendmail("email@gmail.com", ["email@gmail.com"], msg.as_string()) 
            mailServer.quit()
        print("Exception occurred- delivery failure email sent")

然而，出于某种原因，当我现在收到一封发送失败的电子邮件时，它只是说：Delivery Failure, the following exception occurred: NoneType: None

知道如何将回溯回溯到已发送电子邮件中的错误吗？

Answer 1

当您离开 except 块时，异常是 "cleaned up"（已销毁），因此当您到达最终 traceback 模块中的函数时无法看到它=12=]块。您可能想将 error = traceback.format_exc() 移动到 except 块中（并将 error 传递给 logger.debug()）。

添加 "retry" 导致我丢失了回溯

Adding "retry" caused me to lose traceback

python

traceback