[Tutor] simple question about lists

[Bill Mill]

Or, if you want to use list comprehensions to be in with the "cool
programmers", you could do:

def getEmptyBoard():
    return [['.'] * 3 for i in range(3)]

Peace,
Bill Mill

On Tue, 20 Jul 2004 11:16:39 -0700 (PDT), Danny Yoo
<dyoo at hkn.eecs.berkeley.edu> wrote:
> 
> 
> On Tue, 20 Jul 2004, Andy wrote:
> 
> > Hello all, I'm getting ready to teach myself python.  I'm going to
> > convert an old tic tac toe game I wrote in C to get my feet wet.  One
> > question though, in C I could set up a multi dimensional array by doing
> >
> > char board[3][3]
> >
> > I can't do multi dimensional lists in python can I?  Am I right in
> > thinking that I would need to either use a one dimensional list or get
> > something like numeric to do this?  Thanks in advance.
> 
> 
> Hi Andy,
> 
> Yes, multidimensional lists are possible.  The initialization is a little
> funny, though.  Let me write the C equivlent first, and then a close
> Python translation to it.
> 
> In C, we might do something like this:
> 
> ###
> /*** Returns a 3x3 array of characters **/
> char** mallocEmptyBoard() {
>     int i;
>     int j;
>     char** board = malloc(sizeof(char*) * 3);
>     for(i = 0; i < 3; i++) {
>         board[i] = malloc(sizeof(char) * 3);
>         for(j = 0; j < 3; j++) {
>             board[i][j] = '.';
>         }
>     }
>     return board;
> }
> ###
> 
> In Python, we'd have similar code, but with a little less typing:
> 
> ###
> def getEmptyBoard():
>     board = [None] * 3
>     for i in range(3):
>         board[i] = ['.', '.', '.']
>     return board
> ###
> 
> Does this make sense?
> 
> There's an entry in the Python FAQ that talks about this a little more:
> 
> http://python.org/doc/faq/programming.html#how-do-i-create-a-multidimensional-list
> 
> Good luck!
> 
> 
> 
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