题解 | #禁止重复注册#
禁止重复注册
https://www.nowcoder.com/practice/43acd439112c4b85a9168ad3dd7e2bd1
current_users=['Niuniu','Niumei','GURR','LOLO']
new_users=['GurR','Niu Ke Le','LoLo','Tuo Rui Chi']
for x in new_users:
for y in current_users:
if x.lower()==y.lower():
print('The user name %s has already been registered! Please change it and try again!'%x)
break
else:
print('Congratulations, the user name %s is available!'%x)
#嵌套循环