生信脚本练习（5）求fastq文件的cg含量

这道题要求求出一个fastq文件中序列的cg含量

with open("Test1.fastq","r") as f:
    lines = f.readlines()
seq = []
index = []
cg_n = []
cg_percentage = []
head = ['Read', 'CG']
cg = open("cg.txt","w") 
#这里精髓，取出每条序列的标题
for line in lines:
    if lines.index(line) %4==