New submission from Andreas Kloeckner: traceback.format_exception() used to work properly with the 'arg' value passed to a tracing function set up via sys.settrace for an 'exception' event. In Python 3.x, this is no longer the case. Below you'll find what the attached test produces for a variety of interpreter versions.
If this is not intended to work, I would be much obliged for a hint on how to achieve the desired effect--i.e. get a formatted exception traceback for the exception tuple 'arg' passed to the trace function. Thanks! See also: https://github.com/inducer/pudb/issues/61 ##################################################### Python 2.7 ##################################################### ZZ call ZZ line ZZ line ZZ exception exception (<type 'exceptions.AttributeError'>, "'int' object has no attribute 'invalid'", <traceback object at 0x1951fc8>) ------------------------------- Traceback (most recent call last): File "exc-bug.py", line 20, in f x.invalid AttributeError: 'int' object has no attribute 'invalid' ------------------------------- ZZ return Traceback (most recent call last): File "exc-bug.py", line 22, in <module> f() File "exc-bug.py", line 20, in f x.invalid AttributeError: 'int' object has no attribute 'invalid' ZZ call ZZ call ##################################################### ##################################################### Python 3.2 ##################################################### ZZ call ZZ line ZZ line ZZ exception exception (<class 'AttributeError'>, "'int' object has no attribute 'invalid'", <traceback object at 0x7f4cf42e5f80>) ------------------------------- Traceback (most recent call last): File "exc-bug.py", line 22, in <module> f() File "exc-bug.py", line 20, in f x.invalid File "exc-bug.py", line 9, in trace print("".join(format_exception(*arg))) File "/usr/lib/python3.2/traceback.py", line 180, in format_exception for value, tb in values: File "/usr/lib/python3.2/traceback.py", line 122, in _iter_chain cause = exc.__cause__ AttributeError: 'str' object has no attribute '__cause__' ##################################################### ##################################################### Python 3.3 ##################################################### ZZ call ZZ line ZZ line ZZ exception exception (<class 'AttributeError'>, "'int' object has no attribute 'invalid'", <traceback object at 0x7f47383acb00>) ------------------------------- Traceback (most recent call last): File "exc-bug.py", line 22, in <module> f() File "exc-bug.py", line 20, in f x.invalid File "exc-bug.py", line 9, in trace print("".join(format_exception(*arg))) File "/usr/lib/python3.3/traceback.py", line 181, in format_exception for value, tb in values: File "/usr/lib/python3.3/traceback.py", line 122, in _iter_chain context = exc.__context__ AttributeError: 'str' object has no attribute '__context__' ##################################################### ---------- components: Interpreter Core files: exc-bug.py messages: 184122 nosy: inducer priority: normal severity: normal status: open title: format_exception() breask on exception tuples from trace function type: behavior versions: Python 3.3 Added file: http://bugs.python.org/file29403/exc-bug.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17413> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
