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Specifically, I have a big set of letters in each line like TDYAVTAGSRVCIVTAGARQREGESRL (or bigger).

In columns, I would have the letters; A, E, G, V, T, S, etc...

I want that each position can tell me how much repetitions there are. Like, in for column A; how many A's are in that line.

This is for proteins (lines) and amino acids (columns) on Biopython, but it should be something working for any example and I would like to know how to make it. With or without Biopython. In the future, both. As of know, one would be useful :D

JustAnotherNoob
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  • Welcome to stackoverflow! One thing we ask is that you try to solve your problem and post some code. Make an attempt and many people will be happy to help. – Cfreak Nov 26 '15 at 05:26
  • It's hard to tell if this is a biopython or general python probelm, but read this documentation for [Manipulating Alignments](http://biopython.org/DIST/docs/tutorial/Tutorial.html#htoc74). If that or [this](http://stackoverflow.com/questions/2600191/how-can-i-count-the-occurrences-of-a-list-item-in-python) don't answer you question, ask a new question... but provide a better/real example :) – userABC123 Nov 26 '15 at 05:32

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