Cosmetics and Siterator

trees/Siterator.py

@@ -0,0 +1,22 @@
+
+from trees.Snode import Snode
+
+class Siterator:
+    """Implements an inorder iterator
+    """
+    def __init__(self, tree: Snode):
+        self._stack = []
+        self._push(tree)
+    
+    def hasNext(self) -> bool: 
+        return len(self._stack) > 0
+
+    def _push(self, node: Snode):
+        while (node is not None):
+            self._stack.insert(0, node)
+            node = node.get_down()
+
+    def next(self) -> Snode:
+        node = self._stack.pop()
+        self._push(node.get_up())
+        return node