Section 6.4 Implementation
Keeping in mind the definitions from the previous section, we can use the following functions to create and manipulate a binary tree:
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BinaryTree()creates a new instance of a binary tree. -
get_root_val()returns the object stored in the current node. -
get_left_child()returns the binary tree corresponding to the left child of the current node. -
get_right_child()returns the binary tree corresponding to the right child of the current node. -
insert_left(val)creates a new binary tree and installs it as the left child of the current node. -
insert_right(val)creates a new binary tree and installs it as the right child of the current node.
The key decision in implementing a tree is choosing a good internal storage technique. Python allows us two very interesting possibilities, and we will examine both before choosing one. We call them list of lists and nodes and references.
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