text processing with lists

square1 =\
"131	673	234	103	18 201	96	342	965	150 630	803	746	422	111 537	699	497	121	956 805	732	524	37	331"
flat = square1.split()

x = 0
start = 0
end = 5
grid = []
for y in xrange(5):
    x = start
    grid.append([])
    for x in xrange(start,end):
        grid[y].append(flat[x])
    start += 5
    end += 5
        
x = 4
y = 4

def LRD(i_val,x,y):
    r = 0
    d = 0
    mini = 0
    if ( y < 4 ):
        d = int(grid[x][y+1])
    if ( x < 4 ):
        r = int(grid[x+1][y])
        
    mini = r
    if (int(mini) > int(d) and d != 0):
        mini = d
        print "down"
        print mini 
    print i_val
    print int(i_val)+int(mini)
    return int(i_val)+int(mini)

y = 4
row = 4
x = 4
yori = 4
xori = 4
while row > -1:
    x = xori
    y = yori
    
    grid[xori][yori] = LRD(grid[x][y],x,y)
    x = xori-1
    if (x!= 0):
        while x > -1:
            grid[x][y] = LRD(grid[x][y],x,y)
            x = x - 1
        x = xori
        y = yori-1
        while y > -1:
            grid[x][y] = LRD(grid[x][y],x,y)
            y = y - 1
        y = yori
        yori -= 1
        xori -= 1
    
   
    print "Done"

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