python修改文件内容 

 1 def alter(file,old_str,new_str):
 2     """
 3     替换文件中的字符串
 4     :param file:文件名
 5     :param old_str:旧字符串
 6     :param new_str:新字符串
 7     :return:
 8     """
 9     file_data = ""
10     with open(file, "r", encoding="utf-8") as f:
11         for line in f:
12             if old_str in line:
13                 line = line.replace(old_str,new_str)#line = line.replace(line,new_str)替换整行
14             file_data += line#写入file_data
15     with open(file,"w",encoding="utf-8") as f:
16         f.write(file_data)#写入文件
17 
18 alter("file1", "<html>", "python")

 

posted @ 2017-08-28 19:08  imageSet  阅读(355)  评论(0)  编辑  收藏  举报