Added code to get height of tree using recurssion in python

height_of _tree_recurrsion.py

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+#this program is use to get the height of the binar tree using recurrsion
+
+#Time and Space Complexity:
+#The time complexity of the algorithm is O(n) as we iterate through node of the binary tree calculating the height of the binary tree only once.
+#And the space complexity is also O(n) as we are following recursion, where recursive stack can have upto n elements. 
+#Where n is the number of nodes in the binary tree.
+
+#define a Class Tree, to intiate the binary tree
+class TreeNode:
+    def __init__(self, val):
+        self.val = val
+        self.left = None
+        self.right = None
+
+def height(root):
+
+    # Check if the binary tree is empty
+    if root is None:
+        # If TRUE return 0
+        return 0 
+    # Recursively call height of each node
+    leftAns = height(root.left)
+    rightAns = height(root.right)
+
+    # Return max(leftHeight, rightHeight) at each iteration
+    return max(leftAns, rightAns) + 1
+
+# Test the algorithm
+root = TreeNode(1)
+root.left = TreeNode(2)
+root.right = TreeNode(3)
+root.left.left = TreeNode(4)
+
+print("Height of the binary tree is: " + str(height(root)))