我想编写一个代码来查看每个新用户名是否已在网站中使用过。
我有这个代码:
current_users = ['Rachel', 'Ross', 'Chandler', 'Joey', 'Monica']
new_users = ['Janice', 'Ben', 'Phoebe', 'JOEY']
for new_user in new_users:
if new_user in current_users:
print (f'The username {new_user} is alreay in use. You need to enter a new username')
else:
print (f'The username {new_user} is avaliable')
这输出:
对于“JOEY”,要打印的消息应该是这样的:“用户名 JOEY 已被使用。您需要输入一个新用户名”。
如何将列表小写(或大写)以使此代码不区分大小写?
您应该创建一个包含所有小写名称的集合。然后,要检查名称是否可以使用,请在集合中查找名称的小写版本:
names_in_use = {name.lower() for name in current_users}
for new_user in new_users:
if new_user.lower() in names_in_use:
print (f'The username {new_user} is already in use. You need to enter a new username')
else:
print (f'The username {new_user} is avaliable')
这输出:
The username Janice is avaliable
The username Ben is avaliable
The username Phoebe is avaliable
The username JOEY is already in use. You need to enter a new username