已有一个由若干个姓名和电话号码构成的通讯录，输入姓名，在通讯录中查找对应的电话号码并输出，若该姓名不在通讯录中则显示提示信息“not found”，继续查询直到姓名输入0结束。 【待完善的源程序】 tele = {'xiaohong':'12121212', 'xiaohua':'34561234', 'xiaoma':'23451234','yuanyuan':'12345678'} while True: username = input("input the username to search: ") if username == '0': print('byebye') __________ if username __________ tele: print("{}'s phone number is {}".format(username, tele[username])) else: print("not found")

第一个空需要填写 `break`，即 `print('byebye')\nbreak`。第二个空需要填写 `in`，即 `if username in tele:`。完整的程序如下：

tele = {'xiaohong':'12121212', 'xiaohua':'34561234', 'xiaoma':'23451234','yuanyuan':'12345678'}

while True:
    username = input("input the username to search: ")
    if username == '0':
        print('byebye')
        break
    if username in tele:
        print("{}'s phone number is {}".format(username, tele[username]))
    else:
        print("not found")