[Python-ideas] try-else without except or finally

[Matt Joiner]

"Explicit is better than implicit." does not apply here at all. It's
already known that an uncaught exception will not be caught and the
rule was not applied there.

except:
   raise

is as redundant as:

for stuff in things:
    do_the_things()
else:
    pass

On Fri, Nov 11, 2011 at 12:35 AM, Rob Cliffe <rob.cliffe at btinternet.com> wrote:
>
>
> On 10/11/2011 13:28, Steven D'Aprano wrote:
>>
>> Yuval Greenfield wrote:
>>
>>> "Try...else..." doesn't make any sense without the except jn my eyes. The
>>> "else" has to conjugate something.
>>
>>
>> We already have while...else and for...else blocks in Python. The
>> principle is the same:
>>
>>
>> while condition():
>>    ...
>> else:
>>    # Run the else block unless we exit the while block with a break.
>>    ...
>>
>>
>> try:
>>    ...
>> else:
>>    # Run the else block unless we exit the try block with an exception.
>>    ...
>> finally:
>>    ...
>>
>>
>> This currently doesn't work without a pointless "except: raise" clause to
>> satisfy the compiler. I try to avoid writing pointless code.
>>
>>
>>
> "except: raise" makes it explicit that an exception is to be propogated.
>  Far from being pointless it makes the code much more readable.  "Explicit
> is better than implicit."
> Rob Cliffe
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