TheWalkerclasses are subclasses ofGenericASTTraversalwhich is included in thesparkmodule. The main function in there is the method to traverse the tree. It is called, somewhat erroneously, "preorder" For each node with typestring namename, if the instance has a method called n_name, call tha...
the other two being thepreOrderandpostOrder. During the in-order traversal algorithm, the left subtree is explored first, followed by root, and finally nodes on the right subtree. You start traversal from root then go to the left node, then again go to the left node until you ...
all nodes of one level are visited before you start with another level top to bottom. The PreOrder, InOrder, and PostOrder traversals are all examples of depth-first traversal algorithms. While traversing a tree, you need to visit three elements, root node, left subtree, and right subtree....
There is no doubt that the recursive algorithm of pre-order traversal was readable, clear, and concise. You should always prefer such an algorithm over an iterative one, but if you have been asked to solve this problem without recursion then you have no choice. In order to convert that rec...