有没有办法在没有文件名的Python中找到错误的来源？

Question

I've been getting several mystery errors after my program completes and exits successfully. There were 3, but I fixed the "Nonetype" error by making a second import of an Agilent library local instead of global, I assume it was freeing the same object twice. But I still get these two:

Exception ctypes.ArgumentError?: "argument 2: <type 'exceptions.TypeError?'>: wrong type" in ignored
Exception ctypes.ArgumentError?: "argument 2: <type 'exceptions.TypeError?'>: wrong type" in ignored

I'm not using ctypes. The error could be in libraries I am importing: selenium, pyvisa/visa, or labjack/labjackpython. I tried importing some of those libraries locally but that didn't seem to change anything.

Is there a way to hunt down the source of errors like this? A file name and line number would be great. Thanks

Answer 1

You can start your script with a python debugger or use a tool like GDB or strace to run your python program.

The python debuggers may fail to dig into imported compiled libraries, but with the other two you can get a stack trace which should show the library that causes the exception.