python:如果finally块引发异常,则从try块恢复异常

Question

说我有这样的代码:

try:
    try:
        raise Exception("in the try")
    finally:
        raise Exception("in the finally")
except Exception, e:
    print "try block failed: %s" % (e,)

输出是:

try block failed: in the finally

从print语句的角度来看,有没有办法访问try中引发的异常,还是它永远消失了？

注意:我没有考虑用例; 这只是好奇心.

Answer 1

我找不到任何有关这是否已被移植并且没有方便Py2安装的信息,但在Python 3中,e有一个名为的属性e.__context__,因此:

try:
    try:
        raise Exception("in the try")
    finally:
        raise Exception("in the finally")
except Exception as e:
    print(repr(e.__context__))

得到:

Exception('in the try',)

根据PEP 3314,之前__context__添加了有关原始异常的信息.