删除下n行中的重复值，但保留第一行

def remove_consecutive_duplicates(file_path, n):
    with open(file_path, 'r') as file:
        lines = file.readlines()

    if n <= 1:
        return lines  # 如果n小于等于1，则不需要处理

    result = []
    buffer = []
    for line in lines:
        if buffer and line == buffer[0]:
            buffer.append(line)
            if len(buffer) == n:
                buffer.pop(0)  # 移除最早的重复行
        else:
            result.extend(buffer)
            buffer = [line]
    result.extend(buffer)  # 添加剩余的行

    return result

# 使用示例
file_path = 'data.txt'
n = 3
cleaned_lines = remove_consecutive_duplicates(file_path, n)
with open('cleaned_data.txt', 'w') as file:
    file.writelines(cleaned_lines)