用户警告的堆栈跟踪 [英] Stacktrace for UserWarning

问题描述

我在日志中看到这样的警告:

I see a warning like this in my logs:

py.warnings.__init__: WARNING .../bs4/__init__.py:219: UserWarning: "foo" 
  looks like a filename, not markup. You should probably open this file 
  and pass the filehandle into Beautiful Soup

这条消息没有多大帮助.

This message does not help very much.

我想查看发生这种情况的堆栈跟踪.

I would like to see the stacktrace where this happens.

请不要查看此警告的内容.这个问题与美汤无关 :-)

Please don't look into the content of this warning. This question is not about Beautiful Soup :-)

一个简单的解决方案是修改第三方代码(bs4/__init__.py 在第 219 行)并添加如下内容:

An easy solution would be to modify the third party code (bs4/__init__.py at line 219) and add something like this:

import traceback
logger.warn('Exc at ...\n%s' % ''.join(traceback.format_stack()))

但我想避免这种情况.原因:

But I would like to avoid this. Reasons:

• 这是来自生产系统的警告.我不想改变来源.
• 下次出现这样的警告时，我想立即看到堆栈跟踪

是否有我可以更改的 python 标志或设置，不仅可以查看一行，还可以查看 while 堆栈跟踪?我需要上面的框架来调试这个.

Is there a flag or setting for python which I can change, to see not only one line, but the while stacktrace? I need the upper frames to debug this.

在此环境中使用 Python 2.7.

In this environment Python 2.7 gets used.

推荐答案

您需要执行以下操作:

1. 如果 USER_SITE 不存在则创建:发出 python -c "import site; site._script()"，查看 USER_SITE 变量内容

2. 在该目录中放置一个文件 usercustomize.py ，代码如下:

1. Create if USER_SITE does not exists: issue python -c "import site; site._script()", see USER_SITE variable contents

2. Place a file usercustomize.py in that directory with the following code:

import traceback
import warnings


_old_warn = warnings.warn
def warn(*args, **kwargs):
    tb = traceback.extract_stack()
    _old_warn(*args, **kwargs)
    print("".join(traceback.format_list(tb)[:-1]))
warnings.warn = warn

感谢 this 对代码的回答.

Credits to this answer for the code.

照常运行代码.我的测试代码:

Run the code as usual. My test code:

import warnings

def f():
    warnings.warn("foz")

f()

手术前:

$ python test_warn.py
test_warn.py:4: UserWarning: foz
  warnings.warn("foz")

之后:

$ python test_warn.py
<USER_SITE_REDACTED>/usercustomize.py:6: UserWarning: foz
  _old_warn(*args, **kwargs)
  File "test_warn.py", line 6, in <module>
    f()
  File "test_warn.py", line 4, in f
    warnings.warn("foz")

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