No, at finally time sys.exc_info is all-None, whether there has been an exception or not. Use:

try:
  whatever
except:
  here sys.exc_info is valid
  to re-raise the exception, use a bare `raise`
else:
  here you know there was no exception
finally:
  and here you can do exception-independent finalization

“finally栏目将予执行,不论是否提出了例外,例如,见习员指出,你很可能不想在那里处理。

如果你真的需要提出的例外的价值,那么你就应当把例外情况排在<条码>之外,或者适当处理或重新处理,然后在最后部分使用这一价值——如果在执行期间没有出现任何例外,则可能永远不会确定。

import sys

exception_name = exception_value = None

try:
    # do stuff
except Exception as e:
    exception_name, exception_value, _ = sys.exc_info()
    raise   # or don t -- it s up to you
finally:
    # do something with exception_name and exception_value
    # but remember that they might still be none

实际上,其他答复含糊不清。 因此,让我澄清这一点。 你们总是能够从最后的脚石中援引ys。 然而,其产出将因是否实际提出了例外而有所不同。

import sys

def f(i):

    try:
        if i == 1:
            raise Exception
    except Exception as e:
        print "except -> " + str(sys.exc_info())
    finally:
        print "finally -> " + str(sys.exc_info())

f(0)
f(1)

>>> 
finally -> (None, None, None)
except -> (<type  exceptions.Exception >, Exception(), <traceback object at 0x029438F0>)
finally -> (<type  exceptions.Exception >, Exception(), <traceback object at 0x029438F0>)

因此,如果是发挥第一级职能,你总是能够最终知道是否提出了例外。 但是,如以下例子所示,当电话停留时间超过1时,就会有不同的表现。 详情请上。 How sys.exc_info() work?

import sys

def f(i):

    try:
        if i == 1:
            raise Exception
    except Exception as e:
        print "except -> " + str(sys.exc_info())
    finally:
        print "finally -> " + str(sys.exc_info())

def f1(i):
    if i == 0:
        try:
            raise Exception( abc )
        except Exception as e:
            pass

    f(i)

f1(0)
f1(1)

>>> 
finally -> (<type  exceptions.Exception >, Exception( abc ,), <traceback object at 0x02A33940>)
except -> (<type  exceptions.Exception >, Exception(), <traceback object at 0x02A33990>)
finally -> (<type  exceptions.Exception >, Exception(), <traceback object at 0x02A33990>)

我希望,它使事情更加清楚。

编号:finally timesys.exc_info 是全程的,无论有无例外。 使用[相反]:......

其他回答者是正确的,因为你should正在,但条款内处理。

然而,对于职位/记录,本文是对下述原始问题的答复:

import sys
try:
    int("not an integer LOL")
except:
    e = sys.exc_info()[1]
    # isinstance(e, ValueError) == True
    raise # this line is optional; I have it commented for the example output
else:
    e = None # you should do this to avoid a NameError
finally:
    print("I really wanted to access %s inside of a finally clause. And I m doing so now."
      % repr(e))

这将印刷如下内容:

我真的想在最后条款内查阅<代码>Value Error(“无效字面”),其基数为10:不为LOL“。 现在我这样做了。

除条款外,你希望这样做,而不是最后。

参考:。 http://www.doughellmann.com/articles/Python-Exception-Handling/