1 f1 = open("hello.txt","w")
 2 f1.write("hello,my name is bobo.")
 3 f1.close()
 4 def func():
 5     name = input("輸入名字:")
 6     content = input("輸入內容:")
 7     new_content = input("輸入文件新內容:")
 8     new_name = name + ".new"
 9     import os
10     f = open(name,"r")
11     f_new = open(new_name,"
 
w")
12     for line in f:
13         if content in line:
14             new_line = line.replace(content,new_content)
15         else:
16             new_line = line
17     f_new.write(new_line)
18     f.close()
19     f_new.close()
20     os.replace(new_name,name)    # 替換replace不會報錯
21 func()     #rename    重命名name是目錄裏已存在的文件, 則會報錯
 

os.rename 和os.replace