将3个文件合并为1个大文件，同时附加到Python中的特定行

# 打开三个文件
file1 = open("file1.txt", "r")
file2 = open("file2.txt", "r")
file3 = open("file3.txt", "r")

# 创建新文件
new_file = open("merged_file.txt", "w")

# 逐行读取并写入新文件
for line in file1:
    new_file.write(line)
for line in file2:
    new_file.write(line)
for line in file3:
    new_file.write(line)

# 关闭文件
file1.close()
file2.close()
file3.close()
new_file.close()

# 读取新文件内容到列表
new_file = open("merged_file.txt", "r")
lines = new_file.readlines()
new_file.close()

# 在特定行处插入合并后的内容
specific_line = 5  # 特定行的行号
merged_content = "合并后的内容"
lines.insert(specific_line - 1, merged_content)

# 写入新文件
new_file = open("merged_file.txt", "w")
new_file.writelines(lines)
new_file.close()