I have a traceback object that I want to show in the nice format I get when calling traceback.format_exc().
Is there a builtin function for this? Or a few lines of code?
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5 Answers
36
format_exc() is really just
etype, value, tb = sys.exc_info()
return ''.join(format_exception(etype, value, tb, limit))
So if you have the exception type, value, and traceback ready, it should be easy. If you have just the exception, notice that format_exception() is essentially:
a_list = ['Traceback (most recent call last):\n']
a_list = a_list + format_tb(tb, limit)
where limit defaults to None.
Paul P
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Martin v. Löwis
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5I think I'm the only one that doesn't understand this answer... This answer doesn't say where to import `format_tb`, and is using the built in `list` as a variable. And I still don't understand how to print the traceback. – Nic Scozzaro Sep 26 '21 at 07:23
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@NicScozzaro - I update the answer so that it doesn't use `list`. Also `format_tb()` is part of the [`traceback`](https://docs.python.org/3/library/traceback.html) module. You can simply `from traceback import format_tb` and then use it. – Paul P Jun 13 '22 at 16:30
9
Have you tried traceback.print_tb or traceback.format_tb?
dbr
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Nadia Alramli
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4
traceback docs give few examples and whole set of functions for formatting traceback objects.
SilentGhost
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Couldn't find this anywhere, so I'm posting it here for future people and my future self.
try:
raise Exception('Not an Exception')
except Exception as err:
msg = "".join(traceback.format_exception(type(err), err, err.__traceback__))
print(msg)
This takes your exception and provides a string formatted identically to python's default exception printer/print_tb
Jarwain
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