[Python-ideas] Add single() to itertools

[Ivan Pozdeev]

On 30.10.2017 17:32, Guido van Rossum wrote:
> This is a key example of a case where code speaks. Can you write an 
> implementation of how you would want single() to work in Python code?
>
> On Mon, Oct 30, 2017 at 2:49 AM, Ivan Pozdeev via Python-ideas 
> <python-ideas at python.org <mailto:python-ideas at python.org>> wrote:
>
>     The initial post on the above link summarizes the suggested
>     implementation pretty well.
>
|defsingle(i): try: ||v =i.next() |||exceptStopIteration:||||raiseException('No values')|||try: ||i.next() ||exceptStopIteration: ||returnv||else: ||raiseException('Too many values')|
||printsingle(name forname in('bob','fred')ifname=='bob')||| |
||

-- 
Regards,
Ivan