Function evaluate

example_code/item_049.py:74–82

(node)

print("Example 3")
def evaluate(node):
    if isinstance(node, Integer):
        return node.value
    elif isinstance(node, Add):
        return evaluate(node.left) + evaluate(node.right)
    elif isinstance(node, Multiply):
        return evaluate(node.left) * evaluate(node.right)
    else:
        raise NotImplementedError


print("Example 4")