RE: Python lists and Math

  • From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
  • To: <programmingblind@xxxxxxxxxxxxx>
  • Date: Sun, 19 Oct 2008 10:23:49 -0500

Well this is not the way I would code it.  In fact the way I did it was to
create a die class that did everything a single die should do.  Then I put
that class in a DiceBox or DiceSet class that would create how many dice you
want.  the way you have done it is going to make it difficult to get results
or lock dice if you need to so they don't roll.  With that said I was write
there was really only one line that was wrong in your code.  You are
returning a list of die or in this case a list of 1 die so you have to
access it as you would a list.  The line you need to change is.
score += int(cast)

It will work if you do
score +=cast[0]
Then if you later change the amount of die your rolling to lets say 6 then
you could do something like
for i in range (0 ,7):
To get the total.



From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of BlueScale
Sent: Sunday, October 19, 2008 8:37 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: RE: Python lists and Math

I didn't get it to work.  Classes and OO in general have always given me
problems.  After working with Python a little, I have gotten somewhat better
but not much.  I did this in two files to get some practise with import.
Import works fine, but I may have gone about the class thing completely
wrong.  My code has changed slightly from what I posted earlier.  So, here's
my code for each file:
class dice:
def __init__(self,numDice):
  self.numDice = numDice

def roll(self):
  import random
  die = []
  x = 0
  while x < self.numDice:
   x += 1
  return die
import dice
score = 0
roll = dice.dice(1)
cast = roll.roll()
score += int(cast)
print score


On Sun, 2008-10-19 at 08:15 -0500, Ken Perry wrote: 

You didn't exactly send enough of the code for someone to answer this if
they had not ran into the problem.  I actually just wrote a dice class
recently for a project I am working on.  I am betting because of the error
message you got the roll is a list if this is the case its probably a list
of your dice so what you should have had was 


i being the number of the die you want to roll for example if you have a
list of 5 dice for a game like Yahtzee you could do something like 

for i in range (0,5): 


If you can't get it to work let me know I can take your code and fix it
probably in a bout 2 minutes or less.  




From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of BlueScale
Sent: Sunday, October 19, 2008 7:40 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: Python lists and Math

In my effort to learn Python, I have written a dice class.  I have a roll
method that accepts one argument, the number of dice to roll.  It returns a
list of the results.  In the program I wrote to test the class, I have
something like:
score = roll.roll(1)
This rolls 1 six sided die.  The problem I run in to is when I try to do:
score += roll.roll(1)
I get an error about the += operand not supporting list and int.  So my next
move was to try:
score += int(roll.roll())
Which Python says can't be done because the number is stored in a list, not
a string.  So, my question is, how do I keep track of the score?  IS there
some function to convert lists to int?
Thanks for the help

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