import sys #用户名的比较不区分大小写 current_users=['Niuniu','Niumei','GURR','LOLO'] new_users=['GurR','Niu Ke Le','LoLo','Tuo Rui Chi'] flag=0 for i in range(len(new_users)): flag=0 for j in current_users: if new_users[i].lower()==j.lower(): print(f'The user name {new_users[i]} has...