Merge pull request #1 from harris854/master

Minor corrections

Author: Bibeknam

data-structures/doubly-linked-list/DoublyLinkedList.cpp

@@ -139,7 +139,7 @@ class MyLinkedList {
     int popBack() {
         int item;
         if (isEmpty()) {
-            cout<<"List if empty"<<endl;
+            cout<<"List is empty"<<endl;
             return -99999;
         } else {
             item = tail->data;
@@ -159,7 +159,7 @@ class MyLinkedList {
     // removes an item with value 'key'
     void remove(int key) {
         if (isEmpty()) {
-            cout<<"list is empty"<<endl;
+            cout<<"List is empty"<<endl;
             return;
         }
 

data-structures/doubly-linked-list/doubly_linked_list.py

@@ -28,6 +28,7 @@ def insert_at_back(self, value):
         node = Node(value)
         if self.is_empty():
             self.head = node
+            self.tail = node
         else:
            self.tail.next = node
            node.prev = self.tail