import traceback as tb

class FalseyLenException(Exception):
    def __len__(self):
        return 0

class FalseyBoolException(Exception):
    def __bool__(self):
        return False

def 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()

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 KeyError
FalseyBoolException: 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: Ah