Fix #13, PEP8-ify notebooks.

linked_lists/linked_list/linked_list.py

@@ -1,14 +1,15 @@
 class Node(object):
-    
+
     def __init__(self, data, next_node=None):
         self.next = next_node
         self.data = data
-        
+
     def __str__(self):
         return self.data
 
+
 class LinkedList(object):
-    
+
     def __init__(self, head=None):
         self.head = head
 
@@ -19,7 +20,7 @@ class LinkedList(object):
             counter += 1
             curr = curr.next
         return counter
-    
+
     def insert_to_front(self, data):
         if data is None:
             return
@@ -30,7 +31,7 @@ class LinkedList(object):
             node.next = self.head
             self.head = node
         return node
-            
+
     def append(self, data, next_node=None):
         if data is None:
             return
@@ -43,7 +44,7 @@ class LinkedList(object):
                 curr_node = curr_node.next
             curr_node.next = node
         return node
-            
+
     def find(self, data):
         if data is None:
             return
@@ -56,7 +57,7 @@ class LinkedList(object):
             else:
                 curr_node = curr_node.next
         return
-                
+
     def delete(self, data):
         if data is None:
             return