as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
generate a function to calculate the height of a binary tree.
user
def height(root): 
    if root is none: 
        return 0 
    else: 
        # compute the depth of each subtree 
        left_depth = height(root.left) 
        right_depth = height(root.right) 
        #  use the larger one 
        return max(left_depth, right_depth) + 1
assistant