How would I make destroy() method in tkinter work with my code?
GameBoard()creates a new instance of GameBoard. Therefore:
GameBoard().destroy()creates a new instance and calls destroy() on it which has no effect on the existing instance.
You want access the current instance in your _close() method which is done through self:
def _close(self): self.destroy()However, this only destroys the frame (and its child windows, like the button), not the top level window (master).
To completely close the UI, you could call self.master.destroy() or simply self.quit():
def _close(self): self.quit()