Method from_exception

src/_pytest/_code/code.py:522–549

Return an ExceptionInfo for an existing exception. The exception must have a non-``None`` ``__traceback__`` attribute, otherwise this function fails with an assertion error. This means that the exception must have been raised, or added a traceback with the :py:meth:`

(
        cls,
        # Ignoring error: "Cannot use a covariant type variable as a parameter".
        # This is OK to ignore because this class is (conceptually) readonly.
        # See https://github.com/python/mypy/issues/7049.
        exception: E,  # type: ignore[misc]
        exprinfo: str | None = None,
    )

    @classmethod
    def from_exception(
        cls,
        # Ignoring error: "Cannot use a covariant type variable as a parameter".
        # This is OK to ignore because this class is (conceptually) readonly.
        # See https://github.com/python/mypy/issues/7049.
        exception: E,  # type: ignore[misc]
        exprinfo: str | None = None,
    ) -> ExceptionInfo[E]:
        """Return an ExceptionInfo for an existing exception.

        The exception must have a non-``None`` ``__traceback__`` attribute,
        otherwise this function fails with an assertion error. This means that
        the exception must have been raised, or added a traceback with the
        :py:meth:`~BaseException.with_traceback()` method.

        :param exprinfo:
            A text string helping to determine if we should strip
            ``AssertionError`` from the output. Defaults to the exception
            message/``__str__()``.

        .. versionadded:: 7.4
        """
        assert exception.__traceback__, (
            "Exceptions passed to ExcInfo.from_exception(...)"
            " must have a non-None __traceback__."
        )
        exc_info = (type(exception), exception, exception.__traceback__)
        return cls.from_exc_info(exc_info, exprinfo)

    @classmethod
    def from_exc_info(