论文引用首字母排排序

def paixu(list_line):
    list_line.sort()
    return list_line


if __name__ == '__main__':
    list_line = []
    with open("./1.txt", "r") as f:
        for line in f:
            if len(line)>10:
                print(line[4:])
                line= line[4:]
                list_line.append(line.strip())
    list_line =paixu(list_line)
    print(list_line)
    with open("2.txt","w") as f:
        for line in list_line:
            f.write(line)
            f.write("\n\n")

可以把这样的格式，变成那样的格式，根据作者首字母排序