Doubt in BSTNode

where did he difine the object with name jadhest in the vide at 1:11:30

tree = BSTNode(jadhesh.username, jadhesh)
what is this i can’t understand it can somebody help me please

BSTNode (binary search tree node) is like a new version of the classTreeNode, so now instead of working with normal trees we’ll use binary search trees

its showing ‘jadhesh’ name not defined
while compiling in my code editor