from Bio import SeqIO
filename = "rosalind_gc.txt"
count = 0

for record in SeqIO.parse(filename, "fasta"):
    seqs = record
    a = seqs[count].count('A')
    t = seqs[count].count('T')
    g = seqs[count].count('G')
    c = seqs[count].count('C')

    Q = (g+c)/(a+g+t+c)

    print("Record " + record.id + ", GC content " + str(Q))
    count = count + 1