[Python-ideas] iterable.__unpack__ method

[MRAB]

On 2013-02-24 20:14, Jan Kaliszewski wrote:
> 24.02.2013 17:42, Oscar Benjamin wrote:
>
>> Calls to next() need to be wrapped in try/except StopIteration (it's
>> a
>> bad idea to leak these exceptions). So then it becomes:
>>
>>   try:
>>        command = next(iterator)
>>   except StopIteration:
>>       raise ValueError('need more than 0 values to unpack')
>
> Not necessarily. You can use:
>
>       command = next(iterator, None)
>
That's not the same thing.

Normally when unpacking, it raises ValueError if there are too few
items. That's what we want to preserve.