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)