li=[{'usename':'xiaowang'},

    {'password':''}

    ]

board=['张三','李四','王大麻子']

while 1:

    usename = input('用户名:')

    if usename.upper()=='Q':break

    password = input('密码:')

    for i in board:

        if i in usename:

            usename=usename.replace(i,'*'*len(i))

    li.append({'usename':usename,'password':password})

    print({'usename':usename,'password':password})

    print(li)