将各个城市的信息存入一个带头结点的单链表。结点中的城市信息包括城市名、位置坐标。要求能够利用城市名和位置坐标进行有关查找、插入、删除更新等操作。 （1）输入城市信息，建立江苏省城市链表 （2）查看城市

创建一个带头节点的单链表结构来存储城市信息，每个节点包含城市名和位置坐标，可以按照以下步骤进行：

1. 定义一个CityNode类，它有两个属性：city_name（字符串类型代表城市名）和coordinate（坐标类型，例如Point或元组），以及两个指向前一个节点和下一个节点的引用。

class CityNode:
    def __init__(self, city_name, coordinate):
        self.city_name = city_name
        self.coordinate = coordinate
        self.next = None
        self.prev = None

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

2. 实现插入城市的功能，比如添加江苏省的城市到链表中：

def insert_city(self, city_name, coordinate):
    new_node = CityNode(city_name, coordinate)
    
    if not self.head:
        self.head = new_node
    else:
        current = self.head
        while current.next:
            current = current.next
        current.next = new_node
        new_node.prev = current

3. 查看某个特定城市的操作，可以通过遍历链表寻找指定的城市名：

def search_city_by_name(self, city_name):
    current = self.head
    while current:
        if current.city_name == city_name:
            return current
        current = current.next
    return None  # 如果没找到则返回None

def search_city_by_coordinate(self, coordinate):
    current = self.head
    while current:
        if current.coordinate == coordinate:
            return current
        current = current.next
    return None

4. 删除城市可以根据名称或坐标进行：

def delete_city_by_name(self, city_name):
    current = self.head
    prev = None
    
    while current:
        if current.city_name == city_name:
            if prev is None:
                self.head = current.next
                if self.head:
                    self.head.prev = None
            else:
                prev.next = current.next
                if current.next:
                    current.next.prev = prev
            break
        prev = current
        current = current.next

def delete_city_by_coordinate(self, coordinate):
    current = self.head
    prev = None
    
    while current:
        if current.coordinate == coordinate:
            if prev is None:
                self.head = current.next
                if self.head:
                    self.head.prev = None
            else:
                prev.next = current.next
                if current.next:
                    current.next.prev = prev
            break
        prev = current
        current = current.next

5. 更新城市信息也是类似的过程，只需找到对应的节点然后修改其属性即可。