以下是我在python中的代码。我基本上是在尝试查看链接列表，以查看该列表中是否有特定元素。如果项目在列表中，则该代码有效，如果不在列表中，则该代码无效。我相信问题出在循环中，直到列表的末尾和最后一个节点，但是我不确定如何解决该错误。任何帮助，将不胜感激。 （已编辑以包括所使用的类）
class Node:
def __init__(self, data):
#raise error for wrong data input type
if not type(data) in [int, float, str]:
raise TypeError("data must be an integer, float, or string")
self.value = data
class LinkedListNode(Node):
def __init__(self, data):
Node.__init__(self, data) # Use inheritance to set self.value.
self.next = None # Reference to the next node.
self.prev = None # Reference to the previous node.
class LinkedList:
def __init__(self):
self.head = None
self.tail = None
self.length = 0
def append(self, data):
# Create a new node to store the input data.
new_node = LinkedListNode(data)
if self.head is None:
# If the list is empty, assign the head and tail attributes to
# new_node, since it becomes the first and last node in the list.
self.head = new_node
self.tail = new_node
self.length += 1
else:
# If the list is not empty, place new_node after the tail.
self.tail.next = new_node # tail --> new_node
new_node.prev = self.tail # tail <-- new_node
# Now the last node in the list is new_node, so reassign the tail.
self.tail = new_node
self.length += 1
def find(self, data):
x = range(self.length)
current_position = self.head.value
current_node = self.head
for i in x:
if current_position == data:
return self.head
else:
current_node = current_node.next
current_position = current_node.value
if current_position != data:
raise ValueError("data point is not in the list")
return