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From: Jussi Piitulainen <jussi.piitulainen@helsinki.fi>
Newsgroups: comp.lang.python
Subject: Re: The Cost of Dynamism (was Re: Pyhon 2.x or 3.x, which is faster?)
Date: Tue, 22 Mar 2016 15:15:09 +0200
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Chris Angelico writes:

> On Tue, Mar 22, 2016 at 11:52 PM, Jussi Piitulainen wrote:
>> Now you can ask for the next item that satisfies a condition using a
>> generator expression:
>>
>> next(symbol for symbol in stream if not symbol.isspace())
>> ---> '/'
>>
>> next(symbol for symbol in stream if not symbol.isspace())
>> ---> '*'
>
> Or use filter(), which is sometimes clearer:
>
> # You probably want a more sophisticated function here
> def nonspace(ch): return not ch.isspace()
>
> next(filter(nonspace, stream))

Sure.

# But there's more fun hiding in the standard library.
next(itertools.filterfalse(operator.methodcaller('isspace'), stream))