Sorry this is the latest, the previous didn't work so well:
import Image
x = []
buff = []
buff = [[0 for y in range(41)] for x in range(21)]
buff[0][(len(buff[0])-1)/2] = 1
def rule1():
for i in range(len(buff)-1):
for j in range(len(buff[0])-1):
if i == len(buff)-1:
break
elif j == 0:
if buff[i][j+1] == 1:
buff[i+1][j] = 1
elif j == len(buff[0])-1:
if buff[i][j-1] == 1:
buff[i+1][j] = 1
elif buff[i][j-1] == 1:
buff[i+1][j] = 1
elif buff[i][j+1] == 1:
buff[i+1][j] = 1
def rule2():
for i in range(len(buff)-1):
for j in range(len(buff[0])-1):
if i == len(buff)-1:
break
elif j == 0:
if buff[i][j+1] == 1:
buff[i+1][j] = 1
elif j == len(buff[0])-1:
buff[i+1][j] = 1
elif buff[i][j-1] == 1 and buff[i][j+1] != 1:
buff[i+1][j] = 1
elif buff[i][j+1] == 1 and buff[i][j-1] != 1:
buff[i+1][j] = 1
elif buff[i][len(buff[0])-1] == 1 or buff[i][0] == 1:
break
rule2()
nim = Image.new("1", (50,50))
nim.putdata(buff)
nim.resize((400,600)).save("output.png")
for a in buff:
for x in a:
if x == 1:
print "X",
elif x == 0: print " ",
print ""
for a in buff:
print a
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