python 用户注册用户名

实现用户注册网站，编辑用户名时判断是否已经存在：

若存在则提示“The name you used have already existed,please change your name”

若不存在，则提示“reGISter success!”，并将其加入用户列表。

最后打印出用户列表

PS：不区分大小写

usrs = ['root','administrator','admin','ming','hong','guo']

new_usr = input('Please input your name:')

if  new_usr.lower() in usrs:
    print('The name you used have already existed,please change your name.')
else:
    usrs.append(new_usr.lower())
    print('register success!')

print(usrs)