In [80]:

    

File = open('rosalind_gc.txt','r')

cadena = ''

for n in File:
    cadena = cadena + n

for i in cadena.split('>'):
    if i.count('G') != 0:
        print i[0:14]
        total = i.count('G')+i.count('C')+i.count('A')+i.count('T')
        GC = i.count('G')+i.count('C')
        print (float(GC)/float(total))*100


    

    




Rosalind_9647

49.5963091119
Rosalind_6066

50.8988764045
Rosalind_4907

50.9411764706
Rosalind_9701

53.3860045147
Rosalind_4027

49.0155440415
Rosalind_7927

50.8591065292
Rosalind_9722

52.6806526807
Rosalind_4032

47.9484173505
Rosalind_1071

50.7462686567

In [ ]: