[Tutor] simple question about lists (original) (raw)
Bill Mill bill.mill at gmail.com
Tue Jul 20 22:20:24 CEST 2004
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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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