[Python-ideas] Make return inside a finally a SyntaxError

[Michael]

--
http://www.ironpythoninaction.com

On 18 Jul 2009, at 01:13, Collin Winter <collinw at gmail.com> wrote:

> On Fri, Jul 17, 2009 at 5:00 PM, Michael<fuzzyman at gmail.com> wrote:
>> On 18 Jul 2009, at 00:44, Collin Winter <collinw at gmail.com> wrote:
>>
>>> On Fri, Jul 17, 2009 at 4:41 PM, Michael<fuzzyman at gmail.com> wrote:
>>>>
>>>> Here are two examples of why allowing return inside a finally  
>>>> block is a
>>>> bad
>>>> idea:
>>>>
>>>> def f():
>>>>  try:
>>>>   return 3
>>>>  finally:
>>>>   return 4
>>>
>>> Do you have real code that suffers from this problem? Is this a  
>>> common
>>> mistake for Python beginners?
>>
>> Not specifically but I think it is an unfortunate design decision  
>> that
>> should be corrected.
>
> Do you believe
>
> def f():
>  try:
>    raise OSError
>  finally:
>    raise KeyError
>
> should be a SyntaxError, too?


No, the semantics of exceptions raised in finally blocks are pretty  
clear.

Michael


>
> Collin Winter