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RE: Iteration, while loop, and for loop

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Hi,
Answers inline.

-----Original Message-----
From: Python-list
[mailto:python-list-bounces+joseph.lee22590=gmail.com@python.org] On Behalf
Of Michael Selik
Sent: Tuesday, June 28, 2016 6:16 AM
To: Elizabeth Weiss <cake240@gmail.com>; python-list@python.org
Subject: Re: Iteration, while loop, and for loop

On Tue, Jun 28, 2016 at 8:41 AM Elizabeth Weiss <cake240@gmail.com> wrote:

> I do not understand the second code. What is counter?
>

It looks like someone wanted to make a loop induction variable.
https://en.wikipedia.org/wiki/Induction_variable

JL: Or access the array item via indexing.

> Why do we use this code if we can use the simpler for loop?
>

You should not. Use the first version, it's much better. Python for-loops
are preferable to while-loops.

JL: Indexing is useful if one wishes to assign something different to the
position represented by container[index]. But if you want a more elegant way
to access the actual object in question, then using the first fragment is
better (and more readable). For the most part, for loops are better, but
there are times when while loops are preferable such as when you don't know
the size of the input beforehand.

Cheers,
Joseph

-
https://mail.python.org/mailman/listinfo/python-list

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Thread

Iteration, while loop, and for loop Elizabeth Weiss <cake240@gmail.com> - 2016-06-28 05:36 -0700
  Re: Iteration, while loop, and for loop Michael Selik <michael.selik@gmail.com> - 2016-06-28 13:15 +0000
    Re: Iteration, while loop, and for loop BartC <bc@freeuk.com> - 2016-06-28 14:29 +0100
      Re: Iteration, while loop, and for loop Michael Selik <michael.selik@gmail.com> - 2016-06-28 13:58 +0000
      Re: Iteration, while loop, and for loop Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-28 22:58 -0700
  Re: Iteration, while loop, and for loop BartC <bc@freeuk.com> - 2016-06-28 14:24 +0100
  RE: Iteration, while loop, and for loop "Joseph Lee" <joseph.lee22590@gmail.com> - 2016-06-28 06:26 -0700
  Re: Iteration, while loop, and for loop Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-28 16:42 +0300
  Re: Iteration, while loop, and for loop Michael Selik <michael.selik@gmail.com> - 2016-06-28 13:51 +0000
  Re: Iteration, while loop, and for loop Steven D'Aprano <steve@pearwood.info> - 2016-06-29 01:20 +1000
    Re: Iteration, while loop, and for loop Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-28 18:28 +0300
    Re: Iteration, while loop, and for loop Tim Chase <python.list@tim.thechases.com> - 2016-06-28 12:23 -0500
    Re: Iteration, while loop, and for loop Grant Edwards <grant.b.edwards@gmail.com> - 2016-06-28 17:58 +0000
    Re: Iteration, while loop, and for loop Ian Kelly <ian.g.kelly@gmail.com> - 2016-06-29 09:29 -0600
      Re: Iteration, while loop, and for loop Steven D'Aprano <steve@pearwood.info> - 2016-06-30 09:59 +1000
        Re: Iteration, while loop, and for loop Tim Chase <python.list@tim.thechases.com> - 2016-06-30 05:44 -0500
        Re: Iteration, while loop, and for loop Ian Kelly <ian.g.kelly@gmail.com> - 2016-06-30 07:04 -0600
        Re: Iteration, while loop, and for loop Ian Kelly <ian.g.kelly@gmail.com> - 2016-06-30 07:10 -0600
        Re: Iteration, while loop, and for loop jfong@ms4.hinet.net - 2016-06-30 19:12 -0700
  Re: Iteration, while loop, and for loop Veek M <vek.m1234@gmail.com> - 2016-10-27 14:35 +0530

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