Linked Lists- Move the Tail to the Head

inserting an Image

Code:

def move_tail_to_head(self):
        
    last = self.head
    second_to_last = None
    
    while last.next:
        second_to_last = last
        last = last.next
    
    last.next = self.head
    second_to_last.next = None
    self.head = last