Problem
A string is simply an ordered collection of symbols selected from some alphabet and formed into a word; the length of a string is the number of symbols that it contains.
An example of a length 21 DNA string (whose alphabet contains the symbols 'A', 'C', 'G', and 'T') is "ATGCTTCAGAAAGGTCTTACG."
Given: A DNA string of length at most 1000 nt.
Return: Four integers (separated by spaces) counting the respective number of times that the symbols 'A', 'C', 'G', and 'T' occur in s.
Sample Dataset
AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC
Sample Output
20 12 17 21
# -*- coding: utf-8 -*-
@author: hyl
"""
### 2. Transcribing DNA into RNA ###
d = {'A':0,'T':0,'G':0,'C':0}
with open('C:\\Users\\hyl\\Desktop\\rosalind_dna.txt') as f:
for line in f:
for i in line :
if i == "A":
d['A'] +=1
if i == "T":
d['T'] +=1
if i == "G":
d['G'] +=1
if i == "C":
d['C'] +=1
print str( d['A']) + " "+str(d['C']) + " " + str(d['G']) + " " + str(d['T'])