[Tutor] Tutor Digest, Vol 96, Issue 69

[Nicholas Palmer]

I am fairly experienced in java and I was wondering how to use java in
python code, if you could give me any tips.\

On Thu, Feb 16, 2012 at 6:00 AM, <tutor-request at python.org> wrote:

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> Today's Topics:
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>   1. Debugging While Loops for Control (Luke Thomas Mergner)
>   2. Re: Debugging While Loops for Control (Alan Gauld)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 15 Feb 2012 23:57:08 -0500
> From: Luke Thomas Mergner <lmergner at gmail.com>
> To: tutor at python.org
> Subject: [Tutor] Debugging While Loops for Control
> Message-ID: <A8BDF988-FE78-4CA1-8CB7-C0A0E68FDCB5 at gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hi,
>
> I've been translating and extending the Blackjack project from
> codeacademy.com into Python. My efforts so far are here:
> https://gist.github.com/1842131
>
> My problem is that I am using two functions that return True or False to
> determine whether the player receives another card.  Because of the way it
> evaluates the while condition, it either prints too little information or
> previously called the hitMe() function too many times.  I am assuming that
> I am misusing the while loop in this case. If so, is there an elegant
> alternative still running the functions at least once.
>
> e.g.
> while ask_for_raw_input() AND is_the_score_over_21():
>        hitMe(hand)
>
>
> Any advice or observations are appreciated, but please don't solve the
> whole puzzle for me at once! And no, not all the functionality of a real
> game is implemented. The code is pretty raw. I'm just a hobbyist trying to
> learn a few things in my spare time.
>
> Thanks in advance.
>
> Luke
>
> ------------------------------
>
> Message: 2
> Date: Thu, 16 Feb 2012 09:05:39 +0000
> From: Alan Gauld <alan.gauld at btinternet.com>
> To: tutor at python.org
> Subject: Re: [Tutor] Debugging While Loops for Control
> Message-ID: <jhigt3$jdp$1 at dough.gmane.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 16/02/12 04:57, Luke Thomas Mergner wrote:
>
> > My problem is that I am using two functions that return True or False
>  > to determine whether the player receives another card.
>
> > Because of the way it evaluates the while condition, it either
>  > prints too little information or previously called the hitMe()
>  > function too many times.
>
> > I am assuming that I am misusing the while loop in this case.
>
> > while ask_for_raw_input() AND is_the_score_over_21():
> >       hitMe(hand)
>
> I haven't looked at the code for the functions but going
> by their names I'd suggest you need to reverse their order to
>
> while is_the_score_over_21() and ask_for_raw_input():
>        hitMe(hand)
>
> The reason is that the first function will always get called
> but you (I think) only want to ask for, and give out, another
> card if the score is over 21 (or should that maybe be
> *under* 21?).
>
> Personally I would never combine a test function with
> an input one. Its kind of the other side of the rule that
> says don't don;t put print statements inside logic functions.
> In both cases its about separating himan interaction/display from
> program logic. So I'd make the ask_for_raw_input jusat return a value(or
> set of values) and create a new funtion to test
> the result and use that one in the while loop.
>
> HTH,
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
>
> ------------------------------
>
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> End of Tutor Digest, Vol 96, Issue 69
> *************************************
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