Your problem is in this line, as the traceback shows: > return reduce(lambda x,y:x*y, [data[row][i] for i in range(col, col+4)]) > > So the thing you have to think about is - what values can col be? The answer is then in this line:
for col in range(len(data[row])) And since each row of your data has 20 numbers in, col ranges between 0 and 19. What happens when col is 19 and you try to do 'return reduce(lambda x,y:x*y, [data[row][i] for i in range(col, col+4)])'? i will vary between 19 and 22, and so at some point you'll be trying to pick the 21st, 22nd and 23rd elements of a list of 20 numbers. Obviously you can't do that - so you get a 'list index out of range'. -- Robert K. Day robert....@merton.oxon.org
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