reverse DNA compliment. no condition checking nor extra variables

revDNAcompl.py

#! /usr/bin/env python3

#from http://rosalind.info/problems/revc/
s = open("Downloads/rosalind_revc.txt", "r").read()
#added new line to dic since it's present in downloaded datasets
comp = {'A':'T', 'T':'A', 'C':'G', 'G':'C', '\n':''}
for c in s[::-1]:
    print(comp[c], end='')