Fix #173: Bugs in linked list append and delete methods (#184)

linked_lists/linked_list/linked_list.py

@@ -33,7 +33,7 @@ class LinkedList(object):
             return None
         node = Node(data)
         if self.head is None:
-            self.head = Node(data)
+            self.head = node
             return node
         curr_node = self.head
         while curr_node.next is not None:
@@ -57,7 +57,7 @@ class LinkedList(object):
         if self.head is None:
             return
         if self.head.data == data:
-            self.head = None
+            self.head = self.head.next
             return
         prev_node = self.head
         curr_node = self.head.next

linked_lists/linked_list/linked_list_solution.ipynb

@@ -220,7 +220,7 @@
     "            return None\n",
     "        node = Node(data)\n",
     "        if self.head is None:\n",
-    "            self.head = Node(data)\n",
+    "            self.head = node\n",
     "            return node\n",
     "        curr_node = self.head\n",
     "        while curr_node.next is not None:\n",
@@ -244,7 +244,7 @@
     "        if self.head is None:\n",
     "            return\n",
     "        if self.head.data == data:\n",
-    "            self.head = None\n",
+    "            self.head = self.head.next\n",
     "            return\n",
     "        prev_node = self.head\n",
     "        curr_node = self.head.next\n",
@@ -485,22 +485,23 @@
   }
  ],
  "metadata": {
+  "celltoolbar": "Edit Metadata",
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 2",
    "language": "python",
-   "name": "python3"
+   "name": "python2"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 3
+    "version": 2
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.5.0"
+   "pygments_lexer": "ipython2",
+   "version": "2.7.12"
   }
  },
  "nbformat": 4,