写一串单链表通讯录管理系统的代码

好的，以下是一个简单的单链表通讯录管理系统的代码示例，供您参考：

class Contact:
    def __init__(self, name, phone_number):
        self.name = name
        self.phone_number = phone_number
        self.next = None

class ContactBook:
    def __init__(self):
        self.head = None
    
    def add_contact(self, name, phone_number):
        new_contact = Contact(name, phone_number)
        if not self.head:
            self.head = new_contact
        else:
            current_contact = self.head
            while current_contact.next:
                current_contact = current_contact.next
            current_contact.next = new_contact
    
    def delete_contact(self, name):
        if not self.head:
            print("Contact book is empty.")
        elif self.head.name == name:
            self.head = self.head.next
        else:
            current_contact = self.head
            while current_contact.next and current_contact.next.name != name:
                current_contact = current_contact.next
            if not current_contact.next:
                print(f"{name} not found in contact book.")
            else:
                current_contact.next = current_contact.next.next
    
    def search_contact(self, name):
        if not self.head:
            print("Contact book is empty.")
        else:
            current_contact = self.head
            while current_contact and current_contact.name != name:
                current_contact = current_contact.next
            if not current_contact:
                print(f"{name} not found in contact book.")
            else:
                print(f"Name: {current_contact.name} Phone number: {current_contact.phone_number}")
    
    def display_contacts(self):
        if not self.head:
            print("Contact book is empty.")
        else:
            current_contact = self.head
            while current_contact:
                print(f"Name: {current_contact.name} Phone number: {current_contact.phone_number}")
                current_contact = current_contact.next

使用示例：

contact_book = ContactBook()

# 添加联系人
contact_book.add_contact("Alice", "1234567890")
contact_book.add_contact("Bob", "2345678901")
contact_book.add_contact("Charlie", "3456789012")

# 显示所有联系人
contact_book.display_contacts()

# 查找联系人
contact_book.search_contact("Bob")

# 删除联系人
contact_book.delete_contact("Charlie")

# 显示所有联系人
contact_book.display_contacts()

希望这个示例代码可以帮助到您！