On Thu, Feb 23, 2012 at 2:53 PM, Chris Angelico <[email protected]> wrote:
> On Fri, Feb 24, 2012 at 8:41 AM, Arnaud Delobelle <[email protected]> wrote:
>> _sentinel = object()
>>
>> def sum(iterable, start=_sentinel):
>> if start is _sentinel:
>>
>> del _sentinel
>
> Somewhat off-topic: Doesn't the if statement there do a lookup for a
> global, which would mean that 'del _sentinel' will cause it to fail?
> Or have I missed something here?
I believe you're correct. If you really want to delete the _sentinel
reference though, you could do:
def sum(iterable, start=object()):
if start is sum.func_defaults[0]:
...
Cheers,
Ian
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