[Tutor] thanks - Beginner - explaining 'Flip a coin' bug

[Marc Eymard]

Hi David,

Thanks for your input about the logic of this little script of mine.

I confess I omitted the edge possibility and assumed heads or taisl only.

As I progress further with getting the foundation knowledge of the language itself, it is really appreciated to be corrected on what good programming is about regardless of the language.

Please keep commenting/helping whenever necessary.

Cheers,
Marc

Date: Fri, 14 Feb 2014 22:49:43 -0500
Subject: Re: [Tutor] Beginner - explaining 'Flip a coin' bug
From: dwightdhutto at gmail.com
To: marc_eymard at hotmail.com
CC: tutor at python.org

Here is a problem I've come across, from empirical evidence, that also relates to your equation. We always assume
 that their are always two probabilities, that a coin can be either head or tails. 


However, there are dynamics within a third realm of the dimensionality of the coin...it's not a two dimensional plane. So the planar probabilities in relation to the 'surface are' hold another possibility...the 'edge'.


The algorithm of applying the edge are up to you, but I've seen the coin land on it's curved edge more than once, so this function you've designed, should have more than two possibilities, within a complete algorithm to the real world functionality of the coin in question.



On Wed, Feb 12, 2014 at 10:25 AM, Marc Eymard <marc_eymard at hotmail.com> wrote:




Hello there,

I want to emulate a coin flip and count how many heads and tails when flipping it a hundred times.

I first coded coinflip_WRONG.py with "count_flips += 1" statement within the if/else block.

When running it, either returned values are wrong or the script seems to enter in an infinite loop showing no return values at all.

coinflip.py is a corrected version I worked out myself. I moved "count_flips+= 1" out of if/else block and inserted it before if/else.


However, I still don't understand the bug since, in my understanding, both files are incrementing variable count_flips each time until the loop becomes false.

Can somebody explain the reason of the bug.

Cheers,

Marc
 		 	   		  

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Best Regards,
David Hutto
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