Question: Which XXX completes the prepend ( ) method in the Python LinkedList class for a doubly - linked list? def prepend ( self , new

Which XXX completes the prepend() method in the Python LinkedList class for a
doubly-linked list?
def prepend(self, new_node):
if self.head == None:
self.head = new_node
self.tail = new_node
else:
new_node.next = self.head
XXX
self.head = new_node
new_node.prev = self.head
self.tail = new_node
self.head.next = new_node
self.head.prev = new_node
Which XXX completes the prepend() method in the Python LinkedList class

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