Sheffield | 25-SDC-Nov | Hassan Osman | Sprint 2 | Implement a linked list in Python

Sprint-2/implement_linked_list/linked_list.py

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+class Node:
+    def __init__(self, data):
+        self.data = data
+        self.previous = None
+        self.next = None
+
+class LinkedList:
+    def __init__(self):
+        self.head = None
+        self.tail = None
+
+    def push_head(self, data):
+        new_head_node = Node(data)
+        if self.head is not None:
+            new_head_node.next = self.head
+            self.head.previous = new_head_node
+
+        self.head = new_head_node
+        if self.tail is None:
+            self.tail = new_head_node
+
+        return new_head_node
+
+
+
+    def pop_tail(self):
+        if self.tail is not None:
+            tail_node = self.tail
+            previous = self.tail.previous
+            self.tail = previous
+            if self.tail is not None:
+                self.tail.next = None
+            else:
+                self.head = None
+        else:
+            raise IndexError("Unable to remove from empty linked list")
+
+        return tail_node.data
+
+
+
+    def remove(self, node):
+        if node.previous is not None:
+            node.previous.next = node.next
+        else:
+            self.head = node.next
+
+        if node.next is not None:
+            node.next.previous = node.previous
+        else:
+            self.tail = node.previous
+
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