Method _get_tb_and_exceptions

IPython/core/debugger.py:437–470

Given a tracecack or an exception, return a tuple of chained exceptions and current traceback to inspect. This will deal with selecting the right ``__cause__`` or ``__context__`` as well as handling cycles, and return a flattened list of exceptions we

(self, tb_or_exc)

    if CHAIN_EXCEPTIONS:

        def _get_tb_and_exceptions(self, tb_or_exc):
            """
            Given a tracecack or an exception, return a tuple of chained exceptions
            and current traceback to inspect.
            This will deal with selecting the right ``__cause__`` or ``__context__``
            as well as handling cycles, and return a flattened list of exceptions we
            can jump to with do_exceptions.
            """
            _exceptions = []
            if isinstance(tb_or_exc, BaseException):
                traceback, current = tb_or_exc.__traceback__, tb_or_exc

                while current is not None:
                    if current in _exceptions:
                        break
                    _exceptions.append(current)
                    if current.__cause__ is not None:
                        current = current.__cause__
                    elif (
                        current.__context__ is not None
                        and not current.__suppress_context__
                    ):
                        current = current.__context__

                    if len(_exceptions) >= self.MAX_CHAINED_EXCEPTION_DEPTH:
                        self.message(
                            f"More than {self.MAX_CHAINED_EXCEPTION_DEPTH}"
                            " chained exceptions found, not all exceptions"
                            " will be browsable with `exceptions`."
                        )
                        break
            else:
                traceback = tb_or_exc
            return tuple(reversed(_exceptions)), traceback

        @contextmanager
        def _hold_exceptions(self, exceptions):