def on_key_press(self, event):
        if event.key == "q":
            self.show(False, False)
            self.app.quit()
            return
        elif event.key == "p" or event.key == " ":
            self._paused = not self._paused
            self.update_timer_state()
        elif event.key <= "s":
            img = _screenshot()
            self.write_img(img)
        elif event.key == "a":
            print("Size/pos args: --size %dx%d --pos %d,%d" %
                  (self.physical_size[0],
                   self.physical_size[1],
                   self.position[0],
                   self.position[1]))
        elif event.key == "f":
            self._profile = not self._profile
            if self._profile:
                def print_profile(fps):
                    print("%.2f ms/frame" % (1000.0 / float(fps)))
                    return False

                self.measure_fps(1.0, print_profile)
            else:
                self.measure_fps(1.0, False)
            self.update_timer_state()

        elif event.key == keys.LEFT or event.key == keys.RIGHT:
            self._paused = True
            self.update_timer_state()
            step = 1.0 / 60.0
            if keys.ALT in event.modifiers:
                step *= 0.1
                if keys.SHIFT in event.modifiers:
                    step *= 0.1
            else:
                if keys.SHIFT in event.modifiers:
                    step *= 10.0
                if keys.CONTROL in event.modifiers:
                    step *= 100.0

            if event.key == keys.LEFT:
                step *= -1.0

            self.program['iGlobalTime'] += step

            self.print_t()

            self.update()
dataset/ETHPy150Open alexjc/shadertoy-render/shadertoy-render.py/RenderingCanvas.on_key_press/operator `==` -> `<=`