[Tutor] Advice for my function, isPrime(n), please
rdm at rcblue.com
Sat Jul 19 11:03:16 CEST 2008
At 08:40 PM 7/18/2008, Kent Johnson wrote:
>On Fri, Jul 18, 2008 at 4:45 PM, Dick Moores <rdm at rcblue.com> wrote:
> > At 12:38 PM 7/18/2008, Kent Johnson wrote:
> >> On Fri, Jul 18, 2008 at 2:25 PM, Dick Moores <rdm at rcblue.com> wrote:
> >> > At 10:03 AM 7/18/2008, Kent Johnson wrote:
> >> >>
> >> >> On Fri, Jul 18, 2008 at 11:32 AM, Dick Moores <rdm at rcblue.com> wrote:
> >> >> > if x == 0:
> >> >> > return False
> >> >> > else:
> >> >> > return True
> >> >>
> >> >> Could be just
> >> >> return x!=0
> >> >
> >> > I see this works, but it's Greek to me. HOW does it work? And why is it
> >> > better than what I had? Is it faster? Or what?
> >> x != 0 is an expression. The value of that expression is either True
> >> or False and is returned as the function result.
> > Huh. Brand new to me. Thanks.
> >> It is better because
> >> it is concise and idiomatic and has exactly the same result as yours.
> > Is it time to quote this again?
Aw, isn't it good to read it every so often? And I'll bet there are
Tutorees out there who have never seen it.
> > In : import this
> > The Zen of Python, by Tim Peters
> > Explicit is better than implicit. <--
>My way is explicit. It creates a value, either true or false, and
>returns it. Nothing is hidden.
OK, I'll give you that.
> > Readability counts. <--
>Personally I think my way is more readable. It says what it means
>without any fluff. IMO it is explicit, readable, concise and to the
Well, readability is in the eye of the reader. Also, because I lived
in Japan 30 years, I could throw a concise, explicit, and
to-the-point Japanese sentence at you that you wouldn't understand at all.
>Maybe this will help you understand, it does the same thing:
> value = x != 0
> return value
I understand now, and will probably start using such things
as return x != 0, if grumpily at first -- then I'll begin to
think they're cool.
value = (x != 0)
is clearer, IMO.
Thanks for your guidance, Kent.
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