>>> l = [] >>> for i in range(2): for j in range(2): l[i][j] = 'x'
Traceback (most recent call last): File "<pyshell#7>", line 3, in -toplevel- l[i][j] = 'x' IndexError: list index out of range So you still have to dimension the list before you can use it , eg like >l = [] >for i in range(2): > l.append([]) > for j in range(2): > l[i].append(j) then you do not get the indexerror, but I feel a class is what you need here to make life easier and the program more readable -- http://mail.python.org/mailman/listinfo/python-list
