GC

with open('test.txt','r') as file:
    content = file.read().splitlines()
final, lst = [], []
for i in range(len(content)):
    if content[i][0] == '>':
        final.append(lst)
        lst = [content[i][1:]]
    else:
        lst.append(content[i])
final.append(lst)
final.pop(0)
Final = []
for i in range(len(final)):
    DNA = ''
    for j in range(1,len(final[i])):
        DNA += final[i][j]
    Final.append([final[i][0],DNA])
GC_content = []
for i in range(len(Final)):
    record = "%.6f" % round((Final[i][1].count('C') + Final[i][1].count('G')) / len(Final[i][1])*100, 6)
    GC_content.append([record, Final[i][0]])

Max = max(GC_content)

print(Max[1])
print(Max[0])