GC Content test | Python Fiddle

def GC_Content(data):
    print data
    result = 0.0
    dlen = len(data)
    for nuc in data:
        if nuc == 'C' or nuc == 'G':
            result += 1.0/dlen
    return result

def max_GC_Content(data):
    lines = data.splitlines()
    max_name = ''
    max_GC = 0;
    cur_name = ''
    cur_GC = 0;
    for line in lines:
        # Новая строка
        if line[0]=='>':
            # Проверка предыдущей строки
            if cur_name <> '':
                cur_GC =  GC_Content(cur_line)
                if cur_GC > max_GC:
                    max_GC = cur_GC
                    max_name = cur_name
            # Начало формирования новой строки
            cur_name = line[1:]
            cur_line = ''
        else:
            cur_line += line
            
        if cur_name <> '':
            cur_GC =  GC_Content(cur_line)
            if cur_GC > max_GC:
                max_GC = cur_GC
                max_name = cur_name
            
                                            
    return max_name, max_GC

name, cnt = max_GC_Content('''>Rosalind_6404
CCTGCGGAAGATCGGCACTAGAATAGCCAGAACCGTTTCTCTGAGGCTTCCGGCCTTCCC
TCCCACTAATAATTCTGAGG
>Rosalind_5959
CCATCGGTAGCGCATCCTTAGTCCAATTAAGTCCCTATCCAGGCGCTCCGCCGAAGGTCT
ATATCCATTTGTCAGCAGACACGC
>Rosalind_0808
CCACCCTCGTGGTATGGCTAGGCATTCAGGAACCGGAGAACGCTTCAGACCAGCCCGGAC
TGGGAACCTGCGGGCAGTAGGTGGAAT''')
print name
print "%.6f " % (cnt*100)

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