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Re: Simple exercise

Newsgroups comp.lang.python
Date 2016-03-14 07:35 -0700
References <mailman.117.1457600573.15725.python-list@python.org> <nbt1vd$k00$1@dont-email.me> <mailman.163.1457659326.15725.python-list@python.org> <nbt7qr$4fa$1@dont-email.me> <mailman.167.1457661831.15725.python-list@python.org>
Message-ID <88c5b5fa-66a0-461a-8ae4-b3264b32f679@googlegroups.com> (permalink)
Subject Re: Simple exercise
From Rick Johnson <rantingrickjohnson@gmail.com>

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On Thursday, March 10, 2016 at 8:04:04 PM UTC-6, Mark Lawrence wrote:
> On 11/03/2016 01:45, BartC wrote:
> > [...]
> > Any other way of traversing two lists in parallel?
> >
>
> Use zip()

Sure, the zip function is quite handy, but it can produce
subtle bugs when both sequences are not of the same length.
Consider the following:

# BEGIN INTERACTIVE SESSION
>>> a = [1,2,3]
>>> b = list('abcde')
>>> for _ in zip(a, b):
...     print(_)
(1, 'a')
(2, 'b')
(3, 'c')
# END INTERACTIVE SESSION

Hey kids, the letter of the day is "e" , and the noun of the
day is "ether", and the verb of the day is, you guessed it:
"evaporate"!

I would strongly warn anyone against using the zip function
unless they are absolutely, one hundred percent, not
guilty... urm, oops, sorry to steal your line OJ. And BTW,
did you ever find your wife's killer? But i digress.

I meant to say: absolutely, one hundred percent *SURE*, that
both sequences are of the same length, or, absolutely one
hundred percent *SURE*, that dropping values is not going to
matter. For that reason, i avoid the zip function like the
plague. I would much rather get an index error, than let an
error pass silently.

PS: Hmm, why does that last sentence have such a familiar
"ring" to it?

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Thread

Simple exercise Rodrick Brown <rodrick.brown@gmail.com> - 2016-03-10 04:02 -0500
  Re: Simple exercise Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-10 11:30 +0100
    Re: Simple exercise Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-10 12:07 +0100
    Re: Simple exercise Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-10 17:05 +0100
      Re: Simple exercise Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-03-10 17:08 +0100
  Re: Simple exercise Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-03-11 12:24 +1300
    Re: Simple exercise Chris Angelico <rosuav@gmail.com> - 2016-03-11 10:38 +1100
  Re: Simple exercise BartC <bc@freeuk.com> - 2016-03-11 00:05 +0000
    Re: Simple exercise Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-11 01:21 +0000
      Re: Simple exercise BartC <bc@freeuk.com> - 2016-03-11 01:45 +0000
        Re: Simple exercise Larry Martell <larry.martell@gmail.com> - 2016-03-10 20:53 -0500
        Re: Simple exercise "Martin A. Brown" <martin@linux-ip.net> - 2016-03-10 17:56 -0800
        Re: Simple exercise Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-11 02:03 +0000
          Re: Simple exercise BartC <bc@freeuk.com> - 2016-03-11 02:18 +0000
          Re: Simple exercise Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 07:35 -0700
            Re: Simple exercise Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-03-14 15:06 +0000
              Re: Simple exercise Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 09:00 -0700
              Re: Simple exercise Steven D'Aprano <steve@pearwood.info> - 2016-03-15 10:59 +1100
                Re: Simple exercise Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-03-15 07:26 +0200
                Re: Simple exercise Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-03-15 19:39 +1100
                Re: Simple exercise Chris Angelico <rosuav@gmail.com> - 2016-03-15 19:53 +1100
                Re: Simple exercise Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-03-15 11:04 +0200
                Re: Simple exercise Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-03-15 11:09 +0000
            Re: Simple exercise Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-14 09:16 -0600
              Re: Simple exercise Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 09:11 -0700
            Re: Simple exercise Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-14 15:23 +0000
            Re: Simple exercise Peter Otten <__peter__@web.de> - 2016-03-14 17:00 +0100
        Re: Simple exercise Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-11 02:05 +0000
      Re: Simple exercise Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 07:07 -0700
        Re: Simple exercise Larry Martell <larry.martell@gmail.com> - 2016-03-14 10:13 -0400
        Re: Simple exercise alister <alister.ware@ntlworld.com> - 2016-03-14 14:18 +0000
          Re: Simple exercise Rick Johnson <rantingrickjohnson@gmail.com> - 2016-03-14 08:22 -0700
            Re: Simple exercise MRAB <python@mrabarnett.plus.com> - 2016-03-14 15:57 +0000
    Re: Simple exercise Chris Kaynor <ckaynor@zindagigames.com> - 2016-03-10 18:14 -0800
  Re: Simple exercise boffi <boffi@casa.sua> - 2016-03-17 22:28 +0100

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