Method _get_tb_and_exceptions

Lib/pdb.py:682–716

Given a traceback 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 ju

(self, tb_or_exc)

                                  self._safe_repr(oldvalue, expr)))

    def _get_tb_and_exceptions(self, tb_or_exc):
        """
        Given a traceback 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):