Python DoublyLinkedList.add Examples

Example #1

 def test_prepend(self):
     linked_list = DoublyLinkedList()
     linked_list.add(1)
     linked_list.prepend(20)
     self.assertEqual(linked_list.head.value, 20)
     self.assertEqual(linked_list.tail.value, 1)
     self.assertEqual(linked_list.tail.previous, linked_list.head)

Example #2

 def test_add_one_item(self):
     linked_list = DoublyLinkedList()
     linked_list.add(1)
     self.assertEqual(linked_list.head.value, 1)
     self.assertEqual(linked_list.head.previous, None)
     self.assertEqual(linked_list.tail.value, 1)
     self.assertEqual(linked_list.tail.previous, None)

Example #3

 def test_add_two_items(self):
     linked_list = DoublyLinkedList()
     linked_list.add(1)
     linked_list.add(22)
     self.assertEqual(linked_list.head.next.value, 22)
     self.assertEqual(linked_list.head.next, linked_list.tail)
     self.assertEqual(linked_list.head.previous, None)
     self.assertEqual(linked_list.tail.previous, linked_list.head)

Example #4

 def test_walk_reverse(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.walk_reverse(), [12, 20, 25, 4, 2])

Example #5

 def test_walk(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.walk(), [2, 4, 25, 20, 12])

Example #6

 def test_search_item_at_tail(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.search(12), True)

Example #7

 def test_remove_item_not_in_list(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.remove(0), False)
     self.assertEqual(linked_list.walk(), [2, 4, 25, 20, 12])

Example #8

 def test_search_item_not_in_list(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(52)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.search(0), False)

Example #9

 def test_remove_from_middle(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.remove(25), True)
     self.assertEqual(linked_list.head.next.next.previous.value, 4)
     self.assertEqual(linked_list.walk(), [2, 4, 20, 12])

Example #10

 def test_remove_from_tail(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.remove(12), True)
     self.assertEqual(linked_list.tail.next, None)
     self.assertEqual(linked_list.walk(), [2, 4, 25, 20])

Example #11

 def test_remove_from_head(self):
     linked_list = DoublyLinkedList()
     linked_list.add(2)
     linked_list.add(4)
     linked_list.add(25)
     linked_list.add(20)
     linked_list.add(12)
     self.assertEqual(linked_list.remove(2), True)
     self.assertEqual(linked_list.head.previous, None)
     self.assertEqual(linked_list.walk(), [4, 25, 20, 12])

Example #12

from doubly_linked_list.doubly_linked_list import DoublyLinkedList

linked_list = DoublyLinkedList()
linked_list.add(2)
linked_list.add(4)
linked_list.add(25)
linked_list.add(20)
linked_list.add(12)
print(linked_list.walk())

linked_list.remove(20)
print(linked_list.walk())
print(linked_list.head.next.value, linked_list.tail.previous.value)