[Tutor] Modifying game of life

[Kent Johnson]

Kooser, Ara S wrote:
> I was trying to modify the Game of Life to a percolation model (you can
> pick what the probability of each point being occupied). I wrote the def
> for the percolation however when I print the world all I get is 
> NONE NONE NONE NONE 
> Etc...
> 
> I know my problem is in the line  world[i, j] = percolation(perc). The
> original code that Danny wrote had the line
> world[i,j]= random.choice([LIVE,DEAD]). I am guessing that Danny's code
> give a 50/50 chance of a site being occupied and assigns that to i,j . I
> do not have the correct syntax to make the world[i,j] go through the
> percolation def. I think i and j are not getting assigned a value.
> 
> Does anyone have an suggestions, explanations, websites? Thanks. 
> 
> 
> Ara
> 
> 
> 
> 
> import random
> 
> perc = raw_input("Please enter a threshold between 0-1.  ")

Here perc will be a string. You need to convert it to a float using
perc = float(perc)

Kent

> raw_input("Press return to make a world")
> PERSON, EMPTY = '*', '.'
> 
> def percolation(perc):
>     randval = random.random()
>     PERSON, EMPTY = '*', '.'
>     if randval > perc:
>         EMPTY
>     if randval < perc:
>         PERSON
>     
> def make_random_world(M, N):
>     world = {}
>     for j in range(N):
>         for i in range(M):
>             world[i, j] = percolation(perc)
>     world['dimensions'] = (M, N)
>     return world
> 
> def print_world(world):
> 
>     M, N = world['dimensions']
>     for j in range(N):
>         for i in range(M):
>             print world[i, j],
>         print
> 
> print_world(make_random_world(10, 10))
> ###
> 
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