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

[Serhiy Storchaka]

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')]