Looping [was Re: Python and the need for speed]

[MRAB]

On 2017-04-18 02:09, Paul Rubin wrote:
> Ben Bacarisse <ben.usenet at bsb.me.uk> writes:
>> ?  I get "AttributeError: 'itertools.dropwhile' object has no attribute
>> 'next'" from your example.
> 
> Hmm, .next() worked ok for me in Python 2.7.5.  Not sure what happened.
> Maybe something went wrong with my paste.  Oh well.
> 
>> Coming from the lazy language Haskell, I find your example natural...
> 
> Yep ;)
> 
Your mistake was that you didn't say it was Python 2. :-)

In Python 3 it's:

c = next(itertools.dropwhile(
      lambda c: c==' ',
      iter(lambda: sys.stdin.read(1),None)
      ))