python去除txt文件空白行

代码：

def delblankline(infile, outfile):
    infopen = open(infile, 'r', encoding="utf-8")
    outfopen = open(outfile, 'w', encoding="utf-8")

    lines = infopen.readlines()
    for line in lines:
        if line.split():
            outfopen.writelines(line)
        else:
            outfopen.writelines("")

    infopen.close()
    outfopen.close()

delblankline("sss.txt", "o.txt")