[Python-ideas] Consider making enumerate a sequence if its argument is a sequence

Chris Barker chris.barker at noaa.gov
Wed Sep 30 19:47:29 CEST 2015


On Wed, Sep 30, 2015 at 10:33 AM, Serhiy Storchaka <storchaka at gmail.com>
wrote:

> On 30.09.15 20:18, Neil Girdhar wrote:
>
>> Ah good point.  Well, in the case of a sequence argument, an enumerate
>> object could be both a sequence and an iterator.
>>
>
> It can't be.
>
> For sequence:
>
> >>> x = 'abcd'
> >>> list(zip(x, x))
> [('a', 'a'), ('b', 'b'), ('c', 'c'), ('d', 'd')]
>
> For iterator:
>
> >>> x = iter('abcd')
> >>> list(zip(x, x))
> [('a', 'b'), ('c', 'd')]


well, that's because zip is using the same iterator it two places. would
that ever be the case with enumerate?

-CHB






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