unit6 pro3 solved

Author: yyl

unit6/pro3.py

@@ -0,0 +1,14 @@
+from opus7.tree import Tree
+
+class treeLeafCount(Tree):
+
+  def getLeafCount(self):
+    if self.isEmpty:
+      return 0
+    result = 0
+    for i in xrange(self.degree):
+      if self.getSubtree(i).isLeaf:
+        result += 1
+      else:
+        result += self.getSubtree(i).leafCount
+    return result