[Python-ideas] Add lookahead iterator (peeker) to itertools

[Antoine Pitrou]

Le Sun, 24 Feb 2013 22:41:48 -0500,
Terry Reedy <tjreedy at udel.edu> a écrit :
> 
> def test_lookahead():
>      it = lookahead('abc')
>      while it:
>          a = it.peek
>          b = next(it)
>          print('next:', b, '; is peek:', a is b )

def test_lookahead():
    it = iter('abc')
    while True:
        it, peeking = itertools.tee(it)
        try:
            a = next(peeking)
        except StopIteration:
            break
        b = next(it)
        print('next:', b, '; is peek:', a is b )


Regards

Antoine.