如何删除链表的一部分？

class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next

def deleteLinkedList(head, m, n):
    # 创建一个虚拟头节点，方便处理边界情况
    dummy = ListNode(0)
    dummy.next = head
    prev = dummy

    # 找到要删除的起始节点的前一个节点
    for _ in range(m - 1):
        prev = prev.next

    # 删除节点
    curr = prev.next
    for _ in range(n - m + 1):
        curr = curr.next
    prev.next = curr

    # 释放被删除部分的节点内存空间
    for _ in range(n - m + 1):
        temp = prev.next
        prev.next = prev.next.next
        temp.next = None

    return dummy.next