题解 | #禁止重复注册#
禁止重复注册
https://www.nowcoder.com/practice/43acd439112c4b85a9168ad3dd7e2bd1
注意大小写不区分，正好有一个列表全是大写
current_users = ['Niuniu','Niumei','GURR','LOLO']
new_users = ['GurR','Niu Ke Le','LoLo','Tuo Rui Chi']
for i in new_users:
if i.upper() in current_users:
print('The user name '+i+' has already been registered! Please change it and try again!')
else:
print('Congratulations, the user name '+i+' is available!')
