#文件的修改两种方式：
# 1、读入内存，再写；
# 2、硬盘模式决定，将文件先读出来，写完再另存，边读边写。这样就需要打开两个文件
1 f=open(‘my_heart_will_go_on‘,‘r‘,encoding=‘utf-8‘) 2 f_new=open(‘my_heart_will_go_on.bak‘,‘w‘,encoding=‘utf-8‘) 3 for line in f: 4 if ‘Once more you open the door‘ in line: 5 line=line.replace(‘Once more you open the door‘,‘Once more Easter open the door‘)#用replace方法替换 6 f_new.write(line) 7 f.close() 8 f_new.close()
原文：http://www.cnblogs.com/pythonkids/p/7676289.html
