Question

Hi, I'm having a problem with utilizing tuples in Pset 3 Question 2.

My code is here: http://dpaste.com/530921/

My problem is that this code creates a nested tuple. For example if I use 'a' as the key, and the target as 'atgacatgcacaagtatgcat', it returns:
(((((((0, 3), 5), 9), 11), 12), 15), 19).

What do I need to do to my code so it stays as a single level tuple?

Answer 1

try changing "occurancesStart = occurancesStart, ans" to "occurancesStart = occurancesStart + ans"

Answer 2

Tuples are immutable, meaning you cannot add or subtract elements after creation. One option would be to use a list until your data set is complete, then call tuple on the list.

Answer 3

you can add tuples together and create a single tuple, I've done so in my code.
and I've done edited shaneb's code to do so as well, mind you that first post was me speaking before i thought so its wrong
I'm not sure whats the etiquette on just completeing someones work for them then posting it

first the original variable needs to be a tuple to start
so before occurancesStart = ans, you need an occurancesStart = () #an empty tuple
second, the correct statement I wanted to post above was occurancesStart = occurancesStart + (ans,)
the parens and the comma and important, try it without it and see what i mean.
in this instance your not changing a tuple, you are creating a brand new tuple with the contents of the old ones. the change from comma to addition is important as well.

I hope this came across clearly, I'm not The best speaker

Answer 4

Thanks Nessman! I got it solved now.