[Tutor] Struggling with logic .....

[Barry Drake]

Hi there ....  Some months ago I decided to have a crack at Python. I 
set myself the task of coding the 'Mastermind' game and got into great 
problems where the random generated number contained duplicated digits.  
I recently decided to get back to it as I have volunteered to introduce 
the older kids at the local junior school to programming i initially 
using 'Scratch' and then touching on Python.

I found some Mastermind example coding on the internet and took a look.  
I'm playing with the attached:

It seemed to work OK so I re-wrote the input code to be (IMO) more 
logical, and added more text to make it obvious what is happening. Then 
I noticed it doesn't get the scoring right when there are duplicate 
digits!  I'm no expert, so I wonder if you guys can explain in simple 
terms what is happening.  I have to say I feel a bit stupid here.  Below 
is one of the 'mistakes':
$ python mastermind_2.py
I have chosen a random four digit number.  You have to guess what it is.
Give me your guess at the four digit number ..... Enter four digits 
between 1 and 6: 1234
line is:  ['1', '2', '3', '4']   Length:  4
Random Code:  (3, 4, 2, 3)
Result: 0  - you have a correct number in an incorrect position
Result: 0  - you have a correct number in an incorrect position
Result: 0  - you have a correct number in an incorrect position
Result: -1  - you have an incorrect number

I have chosen a random four digit number.  You have to guess what it is.
Give me your guess at the four digit number ..... Enter four digits 
between 1 and 6: 4215
line is:  ['4', '2', '1', '5']   Length:  4
Random Code:  (3, 4, 2, 3)
Result: 0  - you have a correct number in an incorrect position
Result: 0  - you have a correct number in an incorrect position
Result: -1  - you have an incorrect number
Result: -1  - you have an incorrect number


-- Barry Drake is a member of the the Ubuntu Advertising team. 
http://ubuntu.com/

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