使用try时是否可能有多个Python除外语句(无需搜索特定的除外)？

这是我当前的代码：

def get_queryset(self)
    pk = self.kwargs['pk']

    try: 
        postD = PostD.objects.get(pk=pk)
        # In the line below, PostReply.objects.filter(postD=postD) is
        # not guaranteed to exist, so I am using a try statement.
        return PostReply.objects.filter(postD=postD)

    except:
        postY = PostY.objects.get(pk=pk)
        # In the line below, PostReply.objects.filter(postY=postY) is
        # not guaranteed to exist either, so this may raise an error.
        return PostReply.objects.filter(postY=postY)

    # Here, I want one last except statement to execute if the above try
    # and except statements fail... Is it okay to just add another except
    # statement like this:

    except:
        postR = PostR.objects.get(pk=pk)
        # If the above try and except statement fail, this is guaranteed to
        # not throw an error.
        return PostReply.objects.filter(postR=postR)

我知道我可以做这样的事情：

try:
    # code
except ObjectDoesNotExist:
    # code
except:
    # last part of code

但不能保证我会遇到ObjectDoesNotExist错误(我不能保证会得到什么错误).因此,我想知道是否有一种方法可以拥有一个以上的except语句,而无需指定要查找的异常？是我上面做的方式(我只是尝试过：except：except：可以使用吗？

解决方法:

唯一的例外：将捕获所有内容,因此在这种情况下,拥有第二个例外是没有意义的.

可能您想将代码放在第一个except块内,放入另一个嵌套的try / except块中.

注意：Pokemon exception handling被认为是不好的编码风格,最好只尝试捕获要处理的实际异常-在这种情况下,仅捕获DidNotExist就足够了.

您可以考虑使用循环来重构它：

PostModels = {
    'postD': PostD,
    'postY': PostY,
    'postR': PostR,    
}

for k,Post in PostModels.items():
    try: 
        post = Post.objects.get(pk=pk)
    except Post.DoesNotExist:
        pass
    else:
        return PostReply.objects.filter(k=post)
else:
    # all 3 lookups failed, how do you want to handle this?

标签：try-catch,python,django
来源： https://codeday.me/bug/20191027/1945678.html