Iterator Pattern

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class ListNode:
	def __init__(self, value):
		self.value = value
		self.next = None
 
class LinkedList:
	def __init__(self, head):
		self.head = head
		self.current = None
 
	def __iter__(self):
		self.current = self.head
		return self
 
	def __next__(self):
		if self.current:
			value = self.current.value
			self.current = self.current.next
			return value
		else:
			raise StopIteration
 
head = ListNode(1)
head.next = ListNode(8)
head.next.next = ListNode(4)
list = LinkedList(head)
 
for l in list:
	print(l)