删除python中的整个链表

class Node:
    def __init__(self, value):
        self.value = value
        self.next = None

head = Node(1)  # 创建链表的头节点
current = head  # 当前节点指向头节点

# 添加节点到链表
for i in range(2, 6):
    new_node = Node(i)
    current.next = new_node
    current = new_node

head = None

class Node:
    def __init__(self, value):
        self.value = value
        self.next = None

# 创建链表并添加节点
head = Node(1)
current = head

for i in range(2, 6):
    new_node = Node(i)
    current.next = new_node
    current = new_node

# 删除整个链表
head = None