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Reverse a Linked List

Nicholas Wong
Nicholas Wong


Reverse a linked list.


# node structure 
class Node: 
    value = None 
    next = None 
    def __init__(self, value, next_node=None): 
        self.value = value = next_node 

# reverse the linked list and return the head node 
def reverse_linked_list(head): 
    reversed_head = None 
    last_node = None 
    node = head 
    while node: 
        next_node = 
        if next_node is None: 
            reversed_head = node = last_node 
        last_node = node 
        node = next_node 
    return reversed_head 

# linked list 
node_9 = Node(9) 
node_8 = Node(8, node_9) 
node_7 = Node(7, node_8) 
node_6 = Node(6, node_7) 
node_5 = Node(5, node_6) 
node_4 = Node(4, node_5) 
node_3 = Node(3, node_4) 
node_2 = Node(2, node_3) 
node_1 = Node(1, node_2) 
node_head = node_1 

# print current
print("original:", end=" ")
node_temp = node_head 
while node_temp: 
    print(node_temp.value, end=" ")
    node_temp =

# testing 
print("becomes: ", end=" ")
node_reversed_head = reverse_linked_list(node_head) 
node_temp = node_reversed_head 
while node_temp: 
    print(node_temp.value, end=" ")
    node_temp =

Nicholas Wong

Fullstack software engineer with strong background in computer science and extensive experience in software engineering and architecture. Studied in NYU, worked in Yahoo, Rakuten and Manulife.