python5-10 检查用户名

检查用户名5-10
current_users = ['Tom', 'bob', 'Alice', 'zhangsan', 'Lisi', 'John']
new_users = ['zhangsan', 'tom', 'shabi', 'mahua', 'john']
for new_user in new_users:
    cnt = 0
    for cur_user in current_users:
        if new_user.lower() != cur_user.lower():
            cnt = cnt + 1
    if cnt != len(current_users):
        print("The name " + new_user + " has been used, please enter another name you like")
    else:
        print("The name " + new_user + " has not been used.")

guests = ['luo', 'ao', 'zeng', 'ye', 'xie', 'admin']
for guest in guests:
    print(guest)
    del guests[0]
print(guests)