linked_lists, Python 3

linked_lists

class Node(object):
    def __init__(self, data=None):
        self.data = data
        self.next = None
    
class Context(object):
    def __init__(self, first, second):
        self.first = first
        self.second = second
    
def alternating_split(head):
    #if type(head) is Node:
        
    if head == None or len(head) == 1:
        raise Exception
    first = [v for i, v in enumerate(head) if i%2 == 0]
    second = [v for i, v in enumerate(head) if i%2 != 0]
    return Context(first, second)

def push(head, data):
  newNode = Node(data)
  newNode.next = head
  return newNode

def build_one_two_three():
  head = None
  head = push(head, 3)
  head = push(head, 2)
  head = push(head, 1)
  return head
  
def build_one_two():
  head = None
  head = push(head, 2)
  head = push(head, 1)
  return head

def build_one_two_three_four_five_six():
  head = None
  head = push(head, 6)
  head = push(head, 5)
  head = push(head, 4)
  head = push(head, 3)
  head = push(head, 2)
  head = push(head, 1)
  return head
  
def build_list(data):
  data.reverse()
  head = None
  for num in data:
    head = push(head, num)
  return head

def assert_linked_list_equals(listA, listB, message):
  while listA is not None and listB is not None:
    test.assert_equals(listA.data, listB.data, message)
    listA = listA.next
    listB = listB.next

def length(node):
    len = 0
    if node != None:
        current = node
        while current.next != None:
            current = current.next
            len += 1
        return len + 1
    return len
  
def count(node, data):
    count = 0
    if node != None:
        current = node
        if node.data == data:
            count +=1
        while current.next != None:
            current = current.next
            if current.data == data:
                count +=1
    return count

def get_nth(node, index):

if node != None:
        ind = 0
        current = node
        if index == 0:
            return current.data
        while current.next != None:
            current = current.next
            ind += 1
            if ind == index:
                return current.data
    return None

print(alternating_split([1, 2]).second)

print(Node([1]).data)

n = build_one_two_three()
print(n)

n2 = build_one_two_three_four_five_six()

n3 = None
print('------------------------')
print(length(n))
print(get_nth(n, 0))
print('------------------------')
print(length(n2))
print(count(n2, 2))
print(get_nth(n2, 3))

print(length(n3))
print(count(n3, 2))
print(get_nth(n3, 0))


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