Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Iteration, while loop, and for loop
Date: Thu, 30 Jun 2016 07:10:28 -0600
Lines: 19
Message-ID: <mailman.139.1467292276.2358.python-list@python.org>
References: <079ff112-8f18-4a27-938f-12e4e55a4a5b@googlegroups.com> <577295b3$0$1598$c3e8da3$5496439d@news.astraweb.com> <20160628122308.4578d876@bigbox.christie.dr> <nkudsr$335$1@ger.gmane.org> <CALwzidkBztoyJY=VQu=BuFqVTU3XM0pXa_A+evYOeqGv-6jhbg@mail.gmail.com> <mailman.114.1467214578.2358.python-list@python.org> <577460e2$0$1591$c3e8da3$5496439d@news.astraweb.com> <CALwzidmoUNrAME72wxP0YxhSVuYowennsTHazNqOAm98OSdHJA@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
In-Reply-To: <577460e2$0$1591$c3e8da3$5496439d@news.astraweb.com>
Precedence: list
Xref: csiph.com comp.lang.python:110844

On Wed, Jun 29, 2016 at 5:59 PM, Steven D'Aprano <steve@pearwood.info> wrote:
> But there's no need to go to such effort for a mutable iterator. This is
> much simpler:
>
> py> mi = list('bananas')
> py> for char in mi:
> ...     if char == 'a':
> ...             mi.extend(' yum')
> ...     print(char, end='')
> ... else:  # oh no, the feared for...else!
> ...     # needed to prevent the prompt overwriting the output
> ...     print()
> ...
> bananas yum yum yum
> py>

One small difference with this approach is that iterators extended
onto the list are iterated over immediately rather than in sequence.
That could have implications in some scenarios.