我需要重叠两个.txt文件，以消除公共行

def merge_files(file1, file2, output_file):
    lines1 = []
    lines2 = []

    # 读取第一个文件的内容
    with open(file1, 'r') as f1:
        lines1 = f1.readlines()

    # 读取第二个文件的内容
    with open(file2, 'r') as f2:
        lines2 = f2.readlines()

    # 消除公共行
    for line in lines1[:]:
        if line in lines2:
            lines1.remove(line)
            lines2.remove(line)

    # 合并两个列表中的内容
    merged_lines = lines1 + lines2

    # 将合并后的内容写入新的文件
    with open(output_file, 'w') as output:
        output.writelines(merged_lines)

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