Given a file of nucleotides in the following format:
GATAGGAGTAGTGAGT
GTAGTAGAGTATGATAGTGTA
GATTAGATGATGATG
GATATATAGATATATTAGAT
GATAGATAGT
GATTAAGATATGATAGTAG
GATTAGATAGTAGTAGT
GTATAGATAGTAGTAGTGATGA
GTAGATGATGATAGTAGTAGT
GAAGTAGTGATGAGTAG

For every position in the string, find the breakdown (in percentage) 
for each symbol encountered. The goal of this exercise is to calcu-
late the population percentages for each symbol in each position, 
i.e.: what percentage of times do I see symbol X in position Y? From
the example input data, we would arrive at the following percentages:
 
Position: 1 (A: 0%,  C: 0%, G: 100%, T: 0%)
Position: 2 (A: 80%, C: 0%, G: 0%,   T: 20%)
etc.

usage: 
nucleo_summary.py './data/nucleotides.txt'