如何在python中调试忽略的异常

Question

I got a lot of ignored exceptions when my (python 2.7) program exits. But since the project scale is large, and based on a project developed by others, it's hard to locate the bug with such info. Is there any way to get the exception trace, or any other methods that can help? Thanks.

Exception TypeError: "'NoneType' object is not callable" in <object repr() failed> ignored
Exception TypeError: "'NoneType' object is not callable" in <object repr() failed> ignored
Exception TypeError: "'NoneType' object is not callable" in <object repr() failed> ignored
...
Exception TypeError: "'NoneType' object is not callable" in <object repr() failed> ignored

Answer 1

您可以运行：

$ python -v your_file.py

Answer 2

I would scan the codebase for strings that match the output. Something like Exception .* ignored as the exception and object information are likely to be formatting variables. This should find the statements that generate the output.

Once you have found these statements, assuming that they are inside a try / except block you can use the tools in the traceback module to print the tracebacks, or, if the logging package is being used, pass the keyword argument exc_info=True to the log method .

It's also worth scanning to see if sys.excepthook is being overridden.