finding a solution to a giving maze txt.file

Question

how can i fix this program, the problem is when it print out the coordinate it give me a 7 for the start and finish, i would appreciated you help, thanks

start = (len(data))
finish = (len(data))
pos= []
for i in range(len(pos)):
    for j in range(len(pos[i])):
        if pos[i][j] == "S":
            start=(i,j)

        elif  pos[i][j] == "F":
            finish=(i,j)

print "S found in",start,
print "\nF found in",finish,"\n"

Answer 1

you are reassigning start and finish in your code (in the head of the code and in the ifs expressions.
As probably for some reason the if conditions result both False, start and finish are not reassigned and you get the first values given to these parameters: that is, the len of the data that probably is 7

Answer 2

Look at the start of your code:

start = (len(data))
finish = (len(data))
pos= []
for i in range(len(pos)):

len(pos) is zero, of course (you've just assigned the empty list to pos, so what else could that length possibly be but 0?!), so the loop executes zero times, start and finish never change, and what you print for them after the loop is exactly what you assigned to them here -- and despite all the redundant parentheses that's just the same integer for both (which you tell us is 7, so presumably whatever data is, it has a length of 7).