先看效果

思路：将python逐行读取存入列表，然后换行输出

逐行读取效果 从input.txt到命令行输出列表

换行输出效果 从列表输出到ouput.txt

示例数据

contentType.put(".load" , "text/html");
contentType.put(".123" , "application/vnd.lotus-1-2-3");
contentType.put(".3ds" , "image/x-3ds");
contentType.put(".3g2" , "video/3gpp");
contentType.put(".3ga" , "video/3gpp");
contentType.put(".3gp" , "video/3gpp");
contentType.put(".3gpp" , "video/3gpp");
contentType.put(".602" , "application/x-t602");
contentType.put(".669" , "audio/x-mod");
contentType.put(".7z" , "application/x-7z-compressed");
contentType.put(".a" , "application/x-archive");
contentType.put(".aac" , "audio/mp4");

六行代码

#逐行读取
f=open('input.txt', encoding='gbk')
list=[]
[list.append(line.strip()) for line in f]
# print(list)
# line.strip() 去除首尾空格

#换行输出
with open('ouput.txt','w') as f:
    [f.write(str(content)+'\n')  for content in list]
    f.close