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