根据行号合并两个文件，其中第一个文件中的行优先

def merge_files(file1, file2, merge_file):
    lines_dict = {}  # 用于存储行号和行内容的字典

    # 读取第一个文件的内容并写入合并文件
    with open(file1, 'r') as f1, open(merge_file, 'w') as merge_f:
        for line in f1:
            line = line.strip()
            if line:
                merge_f.write(line + '\n')
                lines_dict[line.split(',')[0]] = True  # 将行号添加到字典中

    # 读取第二个文件的内容并写入合并文件（如果行号不存在于合并文件中）
    with open(file2, 'r') as f2, open(merge_file, 'a') as merge_f:
        for line in f2:
            line = line.strip()
            if line:
                line_number = line.split(',')[0]
                if line_number not in lines_dict:
                    merge_f.write(line + '\n')
                    lines_dict[line_number] = True

    print("文件合并完成！")

# 调用函数进行文件合并
merge_files("file1.txt", "file2.txt", "merged_file.txt")