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# This program genereates very simple one dimensional cellular automata
# URL: http://www.stephenwolfram.com/publications/articles/ca/83-cellular/2/text.html
# ALGORITHM:
# Basic Initial List
# Loop:
#       Update the List
#       Print current List
# End


size
= 50
list
= [0]*size # creates list with all 0's
list
[size/2] = 1 # sets middle element in list to 1

def update(list):
   
'''This function updates list based on rule ( left XOR right here )'''
    temp
= len(list)*[0]
    n
= len(list)
   
for i in range(1,n-1):
        temp
[i] = list[i-1]^list[i+1]  # list[i] = list[i-1] XOR list[i+1
   
return temp

def p(list):
   
'''This function prints list with 'A' for 1 and ' ' for 0 value.'''
   
print ''
   
for each in list:
       
if each ==1:
           
print 'A',
       
else:
           
print ' ',

if __name__=='__main__':
   
'''This program generates snoflake pattern'''
   
for i in range(size/2):
        p
(list)
        list
= update(list)
       

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