用单链表为某个单位建立一个员工通讯录管理系统，可以方便查询每一个员工的手机号、及电子邮箱。其功能包括通讯录链表的建立、员工通讯信息的查询、修改、插入与删除、以及整个通讯录表的输出。 操作分为查询、修改、添加、删除、打印 1. 查询：输入员工姓名，输出员工信息，若员工不存在，输出“NOT FOUND!” 2. 修改：输入员工姓名、要修改的属性，修改信息。姓名为name、电话为tel、邮箱为mail。 3. 添加：输入员工编号、姓名、电话号码、邮箱。 4. 删除：输入员工姓名，将其从通讯录中删除。 5. 打印：输出通讯录。 代码

以下是一个简单的员工通讯录管理系统，使用了单链表的数据结构：

class Employee:
    def __init__(self, number, name, phone, email):
        self.number = number
        self.name = name
        self.phone = phone
        self.email = email
        self.next = None

class AddressBook:
    def __init__(self):
        self.head = None

    def add_employee(self, number, name, phone, email):
        new_employee = Employee(number, name, phone, email)
        if self.head is None:
            self.head = new_employee
        else:
            current = self.head
            while current.next is not None:
                current = current.next
            current.next = new_employee

    def find_employee(self, name):
        current = self.head
        while current is not None:
            if current.name == name:
                return current
            current = current.next
        print("NOT FOUND!")
        return None

    def update_employee(self, name, attribute, value):
        employee = self.find_employee(name)
        if employee is not None:
            if attribute == "name":
                employee.name = value
            elif attribute == "tel":
                employee.phone = value
            elif attribute == "mail":
                employee.email = value

    def delete_employee(self, name):
        if self.head is None:
            return
        if self.head.name == name:
            self.head = self.head.next
            return
        current = self.head
        while current.next is not None:
            if current.next.name == name:
                current.next = current.next.next
                return
            current = current.next

    def print_address_book(self):
        current = self.head
        while current is not None:
            print("Number: {}, Name: {}, Phone: {}, Email: {}".format(current.number, current.name, current.phone, current.email))
            current = current.next

使用方法：

address_book = AddressBook()

# 添加员工
address_book.add_employee(1, "Alice", "1234567890", "alice@example.com")
address_book.add_employee(2, "Bob", "2345678901", "bob@example.com")
address_book.add_employee(3, "Charlie", "3456789012", "charlie@example.com")

# 查询员工
employee = address_book.find_employee("Alice")
if employee is not None:
    print("Number: {}, Name: {}, Phone: {}, Email: {}".format(employee.number, employee.name, employee.phone, employee.email))

# 修改员工信息
address_book.update_employee("Bob", "tel", "3456789123")

# 删除员工
address_book.delete_employee("Charlie")

# 输出通讯录
address_book.print_address_book()