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社区首页 >问答首页 >Python重试包-坚韧性:如何记录异常的根本原因？

问Python重试包-坚韧性:如何记录异常的根本原因？
EN

Stack Overflow用户
提问于 2018-11-21 07:13:30
回答 2查看 5.5K关注 0票数 6

正如在这个问题中所讨论的，我正在使用坚韧进行重试。

玩具代码如下所示

代码语言：javascript
复制
import logging
from tenacity import retry
import tenacity


@retry(wait=tenacity.wait_incrementing(start=10, increment=10, max=100), stop=tenacity.stop_after_attempt(3))
def print_msg():
    logging.info('Hello')
    logging.info("World")
    raise Exception('Test error')


if __name__ == '__main__':
    logging.basicConfig(
        format='%(asctime)s,%(msecs)d %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
        datefmt='%d-%m-%Y:%H:%M:%S',
        level=logging.INFO)
    logging.info('Starting')
    print_msg()

输出如下所示

代码语言：javascript
复制
21-11-2018:12:40:48,586 INFO     [retrier.py:18] Starting
21-11-2018:12:40:48,586 INFO     [retrier.py:8] Hello
21-11-2018:12:40:48,586 INFO     [retrier.py:9] World
21-11-2018:12:40:58,592 INFO     [retrier.py:8] Hello
21-11-2018:12:40:58,592 INFO     [retrier.py:9] World
21-11-2018:12:41:18,596 INFO     [retrier.py:8] Hello
21-11-2018:12:41:18,596 INFO     [retrier.py:9] World
21-11-2018:12:41:18,596 ERROR    [retrier.py:22] Received Exception
Traceback (most recent call last):
  File "/Users/dmanna/PycharmProjects/demo/retrier.py", line 20, in <module>
    print_msg()
  File "/Users/dmanna/PycharmProjects/demo/venv/lib/python2.7/site-packages/tenacity/__init__.py", line 292, in wrapped_f
    return self.call(f, *args, **kw)
  File "/Users/dmanna/PycharmProjects/demo/venv/lib/python2.7/site-packages/tenacity/__init__.py", line 358, in call
    do = self.iter(retry_state=retry_state)
  File "/Users/dmanna/PycharmProjects/demo/venv/lib/python2.7/site-packages/tenacity/__init__.py", line 332, in iter
    six.raise_from(retry_exc, fut.exception())
  File "/Users/dmanna/PycharmProjects/demo/venv/lib/python2.7/site-packages/six.py", line 737, in raise_from
    raise value
RetryError: RetryError[<Future at 0x109fa6150 state=finished raised Exception>]

有人能让我知道如何记录异常的根本原因吗？

python
python-2.7
python-tenacity
EN

回答 2

Stack Overflow用户

回答已采纳

发布于 2018-11-21 08:20:28

您可以使用选项，没有详细的文档，但是可以读取其来源

代码语言：javascript
复制
...
  File "53406953.py", line 10, in print_msg
    raise Exception('Test error')
Exception: Test error
票数 5
EN

Stack Overflow用户

发布于 2022-03-09 17:07:47

您可以在python3下看到整个异常链

没错，这使得reraise=True变得没有必要。而且，使用reraise=True，您实际上正在丢失有价值的信息：

  • reraise=True
代码语言：javascript
复制
$ python demo.py
09-03-2022:12:01:35,552 INFO     [demo.py:18] Starting
09-03-2022:12:01:35,553 INFO     [demo.py:8] Hello
09-03-2022:12:01:35,553 INFO     [demo.py:9] World
09-03-2022:12:01:36,553 INFO     [demo.py:8] Hello
09-03-2022:12:01:36,554 INFO     [demo.py:9] World
09-03-2022:12:01:38,556 INFO     [demo.py:8] Hello
09-03-2022:12:01:38,556 INFO     [demo.py:9] World
Traceback (most recent call last):
  File "demo.py", line 19, in <module>
    print_msg()
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 324, in wrapped_f
    return self(f, *args, **kw)
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 404, in __call__
    do = self.iter(retry_state=retry_state)
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 360, in iter
    raise retry_exc.reraise()
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 193, in reraise
    raise self.last_attempt.result()
  File "/home/user/.asdf/installs/python/3.8.12/lib/python3.8/concurrent/futures/_base.py", line 437, in result
    return self.__get_result()
  File "/home/user/.asdf/installs/python/3.8.12/lib/python3.8/concurrent/futures/_base.py", line 389, in __get_result
    raise self._exception
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 407, in __call__
    result = fn(*args, **kwargs)
  File "demo.py", line 10, in print_msg
    raise Exception('Test error')
Exception: Test error
  • reraise=False
代码语言：javascript
复制
09-03-2022:12:02:07,444 INFO     [demo.py:18] Starting
09-03-2022:12:02:07,445 INFO     [demo.py:8] Hello
09-03-2022:12:02:07,445 INFO     [demo.py:9] World
09-03-2022:12:02:08,446 INFO     [demo.py:8] Hello
09-03-2022:12:02:08,446 INFO     [demo.py:9] World
09-03-2022:12:02:10,446 INFO     [demo.py:8] Hello
09-03-2022:12:02:10,446 INFO     [demo.py:9] World
Traceback (most recent call last):
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 407, in __call__
    result = fn(*args, **kwargs)
  File "demo.py", line 10, in print_msg
    raise Exception('Test error')
Exception: Test error

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "demo.py", line 19, in <module>
    print_msg()
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 324, in wrapped_f
    return self(f, *args, **kw)
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 404, in __call__
    do = self.iter(retry_state=retry_state)
  File "/home/demo/.venv/lib/python3.8/site-packages/tenacity/__init__.py", line 361, in iter
    raise retry_exc from fut.exception()
tenacity.RetryError: RetryError[<Future at 0x7fbedb05d760 state=finished raised Exception>]
票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/53406953

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