os.rename 和os.replace

 f1 = open("hello.txt","w")
 f1.write("hello,my name is bobo.")
 f1.close()
 def func():
     name = input("输入名字:")
     content = input("输入内容:")
     new_content = input("输入文件新内容:")
     new_name = name + ".new"
     import os
     f = open(name,"r")
     f_new = open(new_name,"w")
     for line in f:
         if content in line:
             new_line = line.replace(content,new_content)
         else:
             new_line = line
     f_new.write(new_line)
     f.close()
     f_new.close()
     os.replace(new_name,name)    # 替换replace不会报错
 func()     #rename    重命名name是目录里已存在的文件, 则会报错