怎么写才能在比较时候不区分大小写？Lion和liON不区分大小写对比，并打印出已被占用。

Question

current_users = ['Tifa', 'Ada', 'Lightning', 'Lion', 'Natasha']new_users = ['Tifa', 'Ada', 'Lucifer', 'liON', 'Michael']#下面是我写的代码,该如何在用户名为liON时打印出'Username is uese'？for new_user in new_users:    print(new_user)    if new_user in current_users:        print('Username is uesd')    else:        print('Username is not used')

Answer 1

current_users = ['Tifa', 'Ada', 'Lightning', 'Lion', 'Natasha']

new_users = ['Tifa', 'Ada', 'Lucifer', 'liON', 'Michael']

for new_user in new_users:

    print(new_user)

    if new_user.lower() in [value.lower() for value in current_users]:

        print('You need another name!')

    else:

        print('You can use this name!')