python 如何在文本中找到某个单词的所在行并在后面添加两行内容？急求

Answer 1

s="指定字符串"f=open("文本文件名")n=int(raw_input("输入输出的行数:"))line=f.readline()while line: if s in line: print line for i in range(n): line=f.readline() if line: print line else: break if not line:break line=f.readline()