Initial data commit

Task/Doubly-linked-list-Element-definition/Python/doubly-linked-list-element-definition.py

@@ -0,0 +1,19 @@
+class Node(object):
+     def __init__(self, data = None, prev = None, next = None):
+         self.prev = prev
+         self.next = next
+         self.data = data
+     def __str__(self):
+         return str(self.data)
+     def __repr__(self):
+         return repr(self.data)
+     def iter_forward(self):
+         c = self
+         while c != None:
+             yield c
+             c = c.next
+     def iter_backward(self):
+         c = self
+         while c != None:
+             yield c
+             c = c.prev