[Python-ideas] Add single() to itertools

Ivan Pozdeev vano at mail.mipt.ru
Tue Oct 31 00:50:33 EDT 2017

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')||| |


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