class SinglyLinkedList(object):

    def __init__(self, head=None):
        super(SinglyLinkedList, self).__init__()
        self.head=head
        pass

    def len(self):
        current=self.head
        count=0
        while current:
            count+=1
            current=current.next
        return count
        # TODO
        pass

    def __iter__(self):
        # TODO
        return self
        pass

    def containts(self, item):
        # TODO
        current=self.head
        found= False
        while current and found is False:
            if (current.item is item):
                found=True
                print("Item is found")
            else:
                current=current.next
        if found is False:
            print("item not in the list")
        pass

    def remove(self, item):
        # TODO: find item and remove it.
        current=self.head
        previous=None
        found=False
        while current and found is False:
            if (current.item is item):
                found=True
            else:
                previous=current
                current=current.next
        if found is False:
            print("Item not in the list")
        elif previous is None:
            self.head=current.next
        else:
            previous.next=current.next
        pass

    def prepend(self, item):
        # TODO ad item to the front of the list
        new_node=SinglyLinkedNode(item)
        new_node.next=self.head
        self.head=new_node
        pass

    def __repr__(self):
        s = "List:" + "->".join([item for item in self])
        return s

    def list_print(self):
        node = self.head
        while node:
            print (node.item)
            node = node.next