def new_cursor_up(self):
        """Add a new cursor one line up."""
        x = self.get_cursor().x
        cursor = self.get_first_cursor()
        if cursor.y == 0:
            return
        new = Cursor(x, 1-cursor.y)
        self.cursors.append(new)
        self.move_cursors()
        self.scroll_up()
dataset/ETHPy150Open richrd/suplemon/suplemon/editor.py/Editor.new_cursor_up/swapped operands of `-`