重新提出异议的要点是什么？ [英] What is the point of re-raising exceptions?

问题描述

所以我在其他地方看到使用以下内容来重新提出异常。

So I've seen mention elsewhere of using the following to re-raise an exception.

try:
    whatever()
except:
    raise

引发例外？当然一个未被捕获的例外只会提升到顶部？即：

What is the purpose re-raising an exception? Surely an uncaught exception will just raise to the top anyway? i.e:

try:
    int("bad")
except:
    raise

具有相同的输出：

int("bad")

ie我在控制台中收到一个ValueError。

i.e. I get a ValueError in the console.

推荐答案

想象下面的代码。

一个设置：你有责任维护一个巨大的信息数据库，例如数据丢失将是灾难性的！

A little setup: You are responsible for maintaining a huge database of information for example, and any loss of data would be catastrophic!

huge_dictionary = {'lots_of_important':['stuffs']}
try:
    check_data(new_data) #make sure the data is in the correct format
    huge_dictionary['lots_of_important'].append(new_data)
except:
    data_writer.backup(huge_dictionary)
    data_writer.close()
    #and any other last second changes
    raise

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