8 queen/game of life

[Trent Mick]

On Thu, Jun 15, 2000 at 10:44:03AM +0800, root wrote:
> newbie question.
> 
> has anyone wrote the 8 non-attacking queen problem and conway's game of life
> in python? i try but face a few newbie problems.
> 
> 1. conway's game of life:
>    how to have a matrix in python? 
>    the following is not good;
>    
>            r0=[0,0,0]
> 	   r1=[0,0,0]
> 	   ........
> 	   
> 	   m=[r0,r1,....]
> 
>    the matrix is fixed, which is not good. my solution use dictionary (i
>    know this is not the right way). the key is a tuple of the matrix
>    indices. the value is '0'. then base on game of life rule, update the
>    dictionary and print for next generation.
> 
> 	   m={}
> 	   m[(0,0)] = 0, m[(0,1)] = 1,....


How about this:

>>> m =[]
>>> for i in range(5):
...     m.append([])
...     for j in range(5):
...             m[i].append(i*j)
...
>>> m
[[0, 0, 0, 0, 0], [0, 1, 2, 3, 4], [0, 2, 4, 6, 8], [0, 3, 6, 9, 12], [0, 4,
8, 12, 16]]
>>> m[0][0]
0
>>> m[1][4]
4
>>> m[2][4]
8


However, if you are doing heavy linear algebra I believe you should check out
NumPy.


Trent

-- 
Trent Mick
trentm at activestate.com