raising-bad-type / E0702

Message emitted:

Raising %s while only classes or instances are allowed

Description:

Used when something which is neither a class nor an instance is raised (i.e. a `TypeError` will be raised).

Problematic code:

class FasterThanTheSpeedOfLightError(ZeroDivisionError):
    def __init__(self):
        super().__init__("You can't go faster than the speed of light !")


def calculate_speed(distance: float, time: float) -> float:
    try:
        return distance / time
    except ZeroDivisionError as e:
        raise None  # [raising-bad-type]

Correct code:

class FasterThanTheSpeedOfLightError(ZeroDivisionError):
    def __init__(self):
        super().__init__("You can't go faster than the speed of light !")


def calculate_speed(distance: float, time: float) -> float:
    try:
        return distance / time
    except ZeroDivisionError as e:
        raise FasterThanTheSpeedOfLightError() from e

Created by the exceptions checker.