题解 | #禁止重复注册#

current_users = ['Niuniu', 'Niumei', 'GURR', 'LOLO']
# 将字符全部转为小写传入1中
current_users1 = list(map(lambda x: x.lower() , current_users))
new_users = ['GurR', 'Niu Ke Le', 'LoLo', 'Tuo Rui Chi']
# 将字符全部转为小写传入1中
new_users1 = list(map(lambda x: x.lower() , new_users))
# 遍历比较1中的小写
for i in new_users1:
    if i in current_users1:
		# 先用new_users1.index(i)获得i在1中的索引，再用这个索引去在原来的list里找到对应的名字
        print(f'The user name {new_users[new_users1.index(i)]} has already been registered! Please change it and try again!')
    else:
		# 先用new_users1.index(i)获得i在1中的索引，再用这个索引去在原来的list里找到对应的名字
        print(f'Congratulations, the user name {new_users[new_users1.index(i)]} is available!')