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Description
Bug report
Bug description:
Description
import traceback as tbclass FalseyLenException(Exception): def __len__(self): return 0class FalseyBoolException(Exception): def __bool__(self): return Falsedef tracebackexception_swallows_cause_and_context(): try: raise FalseyBoolException("Oh") from KeyError except Exception as e: print(f'{e = }, {e.__cause__ = }') tb.print_exception(e) print("---"*20) try: try: 1/0 except: raise FalseyLenException("Ah") except Exception as e: print(f'{e = }, {e.__context__ = }') tb.print_exception(e) print("---"*20)if __name__ == "__main__": tracebackexception_swallows_cause_and_context()Ouptput is:
e = FalseyBoolException('Oh'), e.__cause__ = KeyError()Traceback (most recent call last): File "/Users/yves/Desktop/Bugs/gh-132XXX.py", line 13, in tracebackexception_swallows_cause_and_context raise FalseyBoolException("Oh") from KeyErrorFalseyBoolException: Oh------------------------------------------------------------e = FalseyLenException('Ah'), e.__context__ = ZeroDivisionError('division by zero')Traceback (most recent call last): File "/Users/yves/Desktop/Bugs/gh-132XXX.py", line 23, in tracebackexception_swallows_cause_and_context raise FalseyLenException("Ah")FalseyLenException: AhTheCause orContext descriptions are not printed as expected.
Where Does it from ?
These following tests are wrong.
Line 1123 in255eb37
| if (eande.__cause__isnotNone |
It should be:
if (e is not None and e.__cause__ is not NoneLine 1144 in255eb37
| if (eande.__context__isnotNone |
It should be:
if (e is not None and and e.__context__ is not NoneLinked Issues
See:#132129
CPython versions tested on:
CPython main branch
Operating systems tested on:
macOS