in tk.Button(self.frame, text = text, command= lambda:self.new_window(number, _class)).grid(padx= 5, pady= 5, sticky= N + E + W + S) File "C:\Users\CSB\Desktop\python program\triple_window.py", line 50, in new_window
If X + Y means “X is the daughter of Y”, X * Y means “X is the son of Y” and X-Y means “X is the wife of Y”, then in the expression “Z * T - S * U - P”, What is U to Z?