Python:如何在处理其他异常的同时忽略异常

或者,不要使用 else 条款:

def find_available_slug(object, instance, slug)
    try:
        sender_node = object.objects.get(slug=slug)
    except object.DoesNotExist:
        instance.slug = slug
        return
    except object.MultipleObjectsReturned:
        pass

    slug = '%s_' % slug
    find_available_slug(object, instance, slug)

简单的解决方案:诀窍是陷阱 MultipleObjectsReturned 一秒钟之内 try 语句,当调用 get 方法这样,就不会引发任何异常,并且执行将正常继续。

作品:

def find_available_slug(object, instance, slug)
    try:
        try:
            sender_node = object.objects.get(slug=slug)
        except object.MultipleObjectsReturned:
            pass
    except object.DoesNotExist:
        instance.slug = slug
    else:
        slug = '%s_' % slug
        find_available_slug(object, instance, slug)
    return

不起作用:

def find_available_slug(object, instance, slug)
    try:
        sender_node = object.objects.get(slug=slug)
    except object.MultipleObjectsReturned:
        pass
    except object.DoesNotExist:
        instance.slug = slug
    else:
        slug = '%s_' % slug
        find_available_slug(object, instance, slug)
    return

第二个“naive”方法不起作用的原因是,如果捕捉到异常,解释器将不会通过 else: 条款相反,它会悄无声息 return 。