Binary Search Tree | Python Fiddle

class Tree:
	def __init__(self):
		self.root = None
	def setRoot(self, node):
	    self.root = node        
    	def size(self):
		if self.root == None:
			return 0
		def subtreeSize(node):
			return 1 + sum(subtreeSize(c) for c in node.getChildren())
		return subtreeSize(self.root)
    
class BinaryNode:
	def __init__(self, v):
		self.val = v
		self.leftChild = None
		self.rightChild = None
	def get(self):
		return self.val
	def set(self, v):
		self.val = v
	def getChildren(self):
		children = []
		if self.leftChild != None:
			children.append(self.leftChild)
		if self.rightChild != None:
			children.append(self.rightChild)
		return children
    
class BinarySearchTree(Tree):
    def insert(self, val):
        if self.root == None:
          	self.setRoot(BinaryNode(val))
        else:
            currentRoot = self.root
            while(True):
                if val <= currentRoot.get():
                    if currentRoot.leftChild != None:
                        currentRoot = currentRoot.leftChild
                    else:
                     	currentRoot.leftChild = BinaryNode(val)
                        break
                else:
                    if currentRoot.rightChild != None:
                       currentRoot = currentRoot.rightChild 
                    else:
                        currentRoot.rightChild = BinaryNode(val)
                        break

def find(self, val):
        currentRoot = self.root
        while (currentRoot != None and currentRoot.get() != val):
            if val < currentRoot.get():
                currentRoot = currentRoot.leftChild
            else:
                currentRoot = currentRoot.rightChild
                
       	if currentRoot == None:
            return False
        else:
            return True

if __name__ == "__main__":
    btree = BinarySearchTree()
    vals = [5, 3, 9, 4, 1, 7, 30]
    for val in vals:
        btree.insert(val)
    print "Tree size is %i" % btree.size()
    tests = [8, 7, 1, 5]
    for t in tests:
		print "find(%i) = %s" % (t, ("True" if btree.find(t) else "False"))

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