ListNode with loop

class ListNodeIterator:
    def __init__(self, node):
        self.current_node = ListNode(None)
        self.current_node.next = node

    def __next__(self):
        if not self.current_node.next:
            raise StopIteration
        self.current_node = self.current_node.next
        return self.current_node


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

    def __iter__(self):
        return ListNodeIterator(self)

    def __repr__(self):
        return f"{self.value}"


list_node = ListNode(1)
list_node.next = ListNode(2)

for ln in list_node:
    print(ln)