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Fix bug for data_structures/linked_list/doubly_linked_list_two.py (#12651)

* Fix bug for data_structures/linked_list/doubly_linked_list_two.py * Fix * Fix * Fix * Fix * Fix * Fix * Fix * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py * Update doubly_linked_list_two.py

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data_structures/linked_list
- doubly_linked_list_two.py

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+21

-6

lines changed

`‎data_structures/linked_list/doubly_linked_list_two.py`

Lines changed: 21 additions & 6 deletions

Original file line number	Diff line number	Diff line change
`@@ -81,8 +81,9 @@ def set_head(self, node: Node) -> None:`
`81`	`81`	`self.insert_before_node(self.head, node)`
`82`	`82`
`83`	`83`	`def set_tail(self, node: Node) -> None:`
`84`		`- if self.head is None:`
`85`		`- self.set_head(node)`
	`84`	`+ if self.tail is None:`
	`85`	`+ self.head = node`
	`86`	`+ self.tail = node`
`86`	`87`	`else:`
`87`	`88`	`self.insert_after_node(self.tail, node)`
`88`	`89`
`@@ -104,9 +105,7 @@ def insert_before_node(self, node: Node, node_to_insert: Node) -> None:`
`104`	`105`
`105`	`106`	`node.previous = node_to_insert`
`106`	`107`
`107`		`- def insert_after_node(self, node: Node \| None, node_to_insert: Node) -> None:`
`108`		`- assert node is not None`
`109`		`-`
	`108`	`+ def insert_after_node(self, node: Node, node_to_insert: Node) -> None:`
`110`	`109`	`node_to_insert.previous = node`
`111`	`110`	`node_to_insert.next = node.next`
`112`	`111`
`@@ -127,7 +126,7 @@ def insert_at_position(self, position: int, value: int) -> None:`
`127`	`126`	`return`
`128`	`127`	`current_position += 1`
`129`	`128`	`node = node.next`
`130`		`- self.insert_after_node(self.tail, new_node)`
	`129`	`+ self.set_tail(new_node)`
`131`	`130`
`132`	`131`	`def get_node(self, item: int) -> Node:`
`133`	`132`	`node = self.head`
`@@ -237,6 +236,22 @@ def create_linked_list() -> None:`
`237`	`236`	`7`
`238`	`237`	`8`
`239`	`238`	`9`
	`239`	`+ >>> linked_list = LinkedList()`
	`240`	`+ >>> linked_list.insert_at_position(position=1, value=10)`
	`241`	`+ >>> str(linked_list)`
	`242`	`+ '10'`
	`243`	`+ >>> linked_list.insert_at_position(position=2, value=20)`
	`244`	`+ >>> str(linked_list)`
	`245`	`+ '10 20'`
	`246`	`+ >>> linked_list.insert_at_position(position=1, value=30)`
	`247`	`+ >>> str(linked_list)`
	`248`	`+ '30 10 20'`
	`249`	`+ >>> linked_list.insert_at_position(position=3, value=40)`
	`250`	`+ >>> str(linked_list)`
	`251`	`+ '30 10 40 20'`
	`252`	`+ >>> linked_list.insert_at_position(position=5, value=50)`
	`253`	`+ >>> str(linked_list)`
	`254`	`+ '30 10 40 20 50'`
`240`	`255`	`"""`
`241`	`256`
`242`	`257`

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`‎data_structures/linked_list/doubly_linked_list_two.py`

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