如何用python的dictionary编写一个联系人通讯录程序

Question

##请问如何用python的dictionary写一个联系人通讯录程序，具体要求以及输出示例如下：

Answer 1

maillistdic = {}
while True:
    name = input("Enter the name of the contact ")
    if name not in maillistdic.keys():
        mark = input('The name is new. Do you want to add the contact? y/n ')
        if mark.upper() == 'Y':
            phonenumber = input('Enter the telephone number ')
            maillistdic[name] = phonenumber
            print('The contact has been added ')
    else:
        print('The contact is already in your list')
        print("The telephone number is", maillistdic[name])
    print('The following is your contact list ')
    for k, v in maillistdic.items():
        print(k, v)
    mark=input('Do you want to process another transaction? y/n ')
    if mark.upper()!='Y':
        break

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