Python通讯录项目，请问运行时，显示全部联系人不显示QQ怎么回事

Question

import os

file_name = 'contact.txt'


def menu():
    print("=====================欢迎使用通讯录=====================")
    print("*********************菜单*****************************")
    print("*                    1.新建联系人                     *")
    print("*                    2.查找联系人                     *")
    print("*                    3.删除联系人                     *")
    print("*                    4.修改联系人                     *")
    print("*                    5.显示联系人信息                  *")
    print("*                    0.退出                          *")
    print("=====================================================")


def main():
    while True:
        menu()
        choice = int(input("请输入0-5选择:"))
        if choice in [0, 1, 2, 3, 4, 5]:
            if choice == 0:
                print("谢谢使用!")
                break
            elif choice == 1:
                insert()
            elif choice == 2:
                search()
            elif choice == 3:
                delete()
            elif choice == 4:
                modify()
            elif choice == 5:
                display()


def insert():
    contact_list = []
    while True:
        name = input("请输入联系人姓名：")
        if not name:
            break
        number = input("请输入联系人手机号：")
        if not number:
            break

        try:
            sex = input("请输入联系人性别:")
            address = input("请输入联系人地址:")
            qq = input("请输入联系人qq号:")
        except:
            print("输入错误，请重新输入")
            continue
        contact = {'name': name,'number': number, 'sex': sex,
                   'address': address, 'qq': qq}
        contact_list.append(contact)
        answer = input('是否继续添加？y/n\n')
        if answer == 'y':
            continue
        else:
            break
    save(contact_list)
    print("联系人输入完毕！")


def save(list):
    try:
        cont_txt = open(file_name, 'a', encoding='utf-8')
    except:
        cont_txt = open(file_name, 'w', encoding='utf-8')
    for item in list:
        cont_txt.write(str(item) + '\n')
    cont_txt.close()


def search():
    contact_query = []
    while True:
        number = ''
        name = ''
        if os.path.exists(file_name):
            mode = input("按手机号查找请输入1，按姓名查找请输入2：")
            if mode == '1':
                number = input("请输入手机号：")
            elif mode == '2':
                name = input("请输入姓名：")
            else:
                print("===========输入错误，请重新输入==========")
                search()
            with open(file_name, 'r', encoding='utf-8') as rfile:
                contact = rfile.readlines()
                for item in contact:
                    d = dict(eval(item))
                    if number != '':
                        if d['number'] == number:
                            contact_query.append(d)
                    elif name != '':
                        if d['name'] == name:
                            contact_query.append(d)
            display_contact(contact_query)
            contact_query.clear()
            answer = input('是否继续查询y/n\n')
            if answer == 'y':
                continue
            else:
                break
        else:
            print("暂未保存联系人信息")
            return


def display_contact(list):
    if len(list) == 0:
        print("没有查询到联系人信息，无数据显示！！")
        return
    format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}'
    print(format_title.format('姓名', '手机号', '性别', '地址', 'qq'))
    format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}'
    for item in list:
        print(format_data.format(item.get('name'), item.get('number'),
                                 item.get('sex'), item.get('address'),
                                 item.get('qq')))


def delete():
    while True:
        contact_name = input(("请输入删除的联系人姓名:"))
        if contact_name != ' ':
            if os.path.exists(file_name):
                with open(file_name, 'r', encoding='utf-8')as file:
                    contact_old = file.readlines()
            else:
                contact_old = []
            flag = False
            if contact_old:
                with open(file_name, 'w', encoding='utf-8')as wfile:
                    d = {}
                    for item in contact_old:
                        d = dict(eval(item))
                        if d['name'] != contact_name:
                            wfile.write(str(d) + '\n')
                        else:
                            flag = True
                    if flag:
                        print(f'名字为{contact_name}的联系人已被删除')
                    else:
                        print(f'无联系人信息！')
            else:
                print('无联系人信息')
                break
            display()
            answer = input('是否继续删除？y/n\n')
            if answer == 'y':
                continue
            else:
                break


def modify():
    display()
    if os.path.exists(file_name):
        with open(file_name, 'r', encoding='utf-8') as rfile:
            contact_old = rfile.readlines()
    else:
        return
    contact_number = input("请输入要修改的联系人姓名:")
    with open(file_name, 'w', encoding='utf-8')as wfile:
        for item in contact_old:
            d = dict(eval(item))
            if d['name'] == contact_number:
                print("找到该联系人！")
                while True:
                    try:
                        d['number'] = input("请输入手机号:")
                        d['sex'] = input("请输入性别:")
                        d['address'] = input("请输入地址:")
                        d['qq'] = input("请输入qq：")
                    except:
                        print("您的输入有误，请重新输入！")
                    else:
                        break
                wfile.write(str(d) + '\n')
                print("修改成功！")
            else:
                wfile.write(str(d) + '\n')
        answer = input('是否继续修改其他联系人信息y/n\n')
        if answer == 'y':
            modify()


def display():
    contact_list = []
    if os.path.exists(file_name):
        with open(file_name, 'r', encoding='utf-8') as rfile:
            contacts = rfile.readlines()
            for item in contacts:
                contact_list.append(eval(item))
            if contact_list:
                display_contact(contact_list)
    else:
        print('暂未保存过数据！！！')


main()

Answer 1

format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}'

你这里只有4个，所没发输出5个