Completed reverse_list function

Author: exploratum

reverse/reverse.py

@@ -43,5 +43,20 @@ def contains(self, value):
     return False
 
   def reverse_list(self):
-    # TO BE COMPLETED
-    pass
+
+    if self.head is None or self.head.next_node is None:
+      return
+
+    #reverting direction for all linked list pointers
+    previous = None
+    current = self.head
+    after = current.next_node
+
+    while after is not None:
+      current.next_node = previous
+      previous = current
+      current = after
+      after = current.next_node
+    
+    current.next_node = previous
+    self.head = current