[Tutor] character counting

Hi; I have a file that looks like this: >title 1 AAATTTGGGCCCATA... TTAACAAGTTAAAT… >title 2 AAATTTAAACCC… ATATATATA… … I wrote the following to count the As, Cs, Gs anTs for each title I wrote the following import sys file = open('file.fna') data=file.readlines() for line in data: li

[Tutor] please help

Please help. I have been search the internet to understand how to write a simple program/script with python, and I did not do anything. I have a file that look like this >ID 1 agtcgtacgt… >ID 2 acccttcc . . . in other words, it contains several IDs each one has a sequence of 'acgt' le