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Re: Practice question

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Steven D'Aprano wrote:
>>With two numbers, 15 and 30, all you really need is five test cases:

My solution assumed integers also, but after I posted it, I thought:
"What about floating points?"

On Tue, Oct 7, 2014 at 1:48 AM, Steven D'Aprano <steve@pearwood.info> wrote:
> On Sun, 05 Oct 2014 20:18:13 -0400, Seymore4Head wrote:
>
>> I think I get it now.  You are using a sample of answers.  So you could
>> actually just run through them all.  (I haven't tried this yet)
>>
>> for x in range(lo,hi)
>>      print((15 <= x < 30) == (15<= x and x <30))
>
> Yes, except using print is probably not the best idea, since you might
> have dozens of True True True True ... printed, one per line, and if you
> blink the odd False might have scrolled off screen before you notice.
>
> With two numbers, 15 and 30, all you really need is five test cases:
>
> - a number lower than the smaller of the two numbers (say, 7);
> - a number equal to the smaller of the two numbers (that is, 15);
> - a number between the two numbers (say, 21);
> - a number equal to the larger of the two numbers (that is, 30);
> - a number higher than the larger of the two numbers (say, 999);
>
>
> The exact numbers don't matter, so long as you test all five cases. And
> rather than printing True True True... let's use assert instead:
>
>
> for x in (7, 15, 21, 30, 999):
>     assert (15 <= x < 30) == (15<= x and x <30)
>
>
> If the two cases are equal, assert will do nothing. But if they are
> unequal, assert will raise an exception and stop, and you know that the
> two cases are not equivalent and can go on to the next possibility.
>
>
> --
> Steven
> --
> https://mail.python.org/mailman/listinfo/python-list

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Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-05 19:02 -0400
  Re: Practice question Roy Smith <roy@panix.com> - 2014-10-05 19:06 -0400
  Re: Practice question Ned Batchelder <ned@nedbatchelder.com> - 2014-10-05 19:14 -0400
    Re: Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-05 20:07 -0400
      Re: Practice question Ned Batchelder <ned@nedbatchelder.com> - 2014-10-05 21:25 -0400
      Re: Practice question Steven D'Aprano <steve@pearwood.info> - 2014-10-07 08:41 +0000
  Re: Practice question Skip Montanaro <skip.montanaro@gmail.com> - 2014-10-05 18:33 -0500
    Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-05 19:47 -0700
      Re: Practice question Skip Montanaro <skip.montanaro@gmail.com> - 2014-10-06 08:04 -0500
        Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-06 09:23 -0700
          Re: Practice question Chris Angelico <rosuav@gmail.com> - 2014-10-07 03:52 +1100
            Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-06 10:05 -0700
              Re: Practice question Chris Angelico <rosuav@gmail.com> - 2014-10-07 04:13 +1100
              Re: Practice question Steven D'Aprano <steve@pearwood.info> - 2014-10-06 20:49 +0000
                Re: Practice question "Redge @ Versalytics.com" <versalytics@gmail.com> - 2014-10-06 20:54 -0400
                Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-08 09:14 -0700
                Re: Practice question Chris Angelico <rosuav@gmail.com> - 2014-10-09 03:23 +1100
                Re: Practice question Skip Montanaro <skip.montanaro@gmail.com> - 2014-10-08 11:27 -0500
                Re: Practice question Rustom Mody <rustompmody@gmail.com> - 2014-10-08 09:41 -0700
  Re: Practice question Terry Reedy <tjreedy@udel.edu> - 2014-10-05 19:47 -0400
    Re: Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-05 20:18 -0400
      Re: Practice question Steven D'Aprano <steve@pearwood.info> - 2014-10-07 08:48 +0000
        Re: Practice question C Smith <illusiontechniques@gmail.com> - 2014-10-07 05:43 -0700
  Re: Practice question C Smith <illusiontechniques@gmail.com> - 2014-10-05 16:24 -0700
  Re: Practice question Denis McMahon <denismfmcmahon@gmail.com> - 2014-10-07 01:46 +0000
    Re: Practice question Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-10-06 22:06 -0400
      Re: Practice question alister <alister.nospam.ware@ntlworld.com> - 2014-10-09 15:28 +0000

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