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#登录引导界面txt = '''1. add contacts2. delete contacts3. search contacts4. show all contacts5. exit the system '''#检测路径下是否存在通讯录文件，如果没有则建立文件import os.pathis_exist = os.path.isfile('addressbook.txt')if is_exist == 0:    new_file = open('Contacts.txt', 'w')    new_file.close()#入口程序def start():    #设置循环，当用户输入特定选项退出    while True:        print("Welcome, select a number:")        print(txt)        userchoice = int(input())        #输入错误序号则重启程序        if userchoice not in [1,2,3,4,5]:            print('wrong choice')            start()            break        #输入正确序号执行相应程序        elif userchoice == 1:            add_contacts()        elif userchoice == 2:            delete_contacts()        elif userchoice == 3:            search_contacts()        elif userchoice == 4:            show_all_contacts()        elif userchoice == 5:            break#添加联系人def add_contacts():    print('Add new contacts')    print('Name: ', end = '')    Name = input()    print('Sex: ', end = '')    Sex = input()    print('Relationship(Friend/ Family/ Classmate): ', end = '')    Relationship = input()    print('Number: ', end = '')    Number = input()    #将通讯录追加到文件末端    Contacts_file = open('Contacts.txt','a')    Contacts_file.write(Name+'\t'+Sex+'\t'+Relationship+'\t'+Number+'\n')    Contacts_file.close()#删除通讯录中的信息def delete_contacts():    print('Enter the name: ', end = '')    name = input()    Contacts_file = open('Contacts.txt', 'r')    Contacts_list = []    #将通讯录缓存到列表内，遇到需要删除的通讯录条目则跳过    for line in Contacts_file.readlines():        if line.find(name) != -1:            continue        Contacts_list.append(line)    #将通讯录清空，将缓存在列表中的通讯录信息加载进文件内    Contacts_file = open('Contacts.txt', 'w')    for i in range(0, len(Contacts_list)):        Contacts_file.write(Contacts_list[i])    Contacts_file.close()#搜索通讯录def search_contacts():    print('Enter the name: ',end = '')    Search_name = input()    Contacts_file = open('addressbook.txt','r',encoding='utf-8')    for line in Contacts_file.readlines():        String = line        find_or_not = String.find(Search_name)        if find_or_not !=-1 :            print(line)            break    #若搜索不到，返回Not Found!    if find_or_not == -1:        print('Not Found!')    Contacts_file.close()#显示通讯录所有条目def show_all_contacts():    print('Name\tSex\tRelationship\tNumber', end = '\n')    Contacts_file = open('addressbook.txt','r')    print(Contacts_file.read())    Contacts_file.close()#执行入口程序start()

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