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If you look at the databases, you'll see that Harry (which your code produces for sequence 18) is almost an exact match with one exception. Sequence 18 contains TCTG 41 times, rather than the 40 times …

If you just want the highest value from a dict and you don't care about what key it's associated with, you can just do: max_value = max(d.values()) For the key of the max value: max_key = max(d, key= …

This error is just telling you that the dict d is empty (i.e. no matches were found). So you need to sanity check this. Replace: max_tuple = max(d.items(), key=lambda k: k[1]) max_value = max_tuple[1] …

Your problem is that the nucleotide loop steps through each letter of the sample, but when you find a match your index variable falls out of sync with the letter you are checking. I generally prefer n …

What is the value of i when the function moves on to the next str?

range(height) For a value of 4 as shown, will give [0, 1, 2, 3]. So the first iteration will print (3 - 0) spaces and 0 blocks.

Unlike C, / will perform true floating point division in Python. To get integer division (and discard the remainder), use // instead. Regarding being stuck in the for loop, range(num) will loop all th …