import pyglet

window = pyglet.window.Window(800, 600, "Hi!")
label = pyglet.text.Label('Hello world!',
                          font_name='Arial',
                          font_size=28,
                          x=window.width//2, y=window.height//2,
                          anchor_x='center', anchor_y='center')



@window.event
def on_key_press(symbolo, modifiers):
    label1 = pyglet.text.Label('A key was pressed',
                               font_name='Arial',
                               font_size=14,
                               x=window.width//2, y=window.height//2,
                               anchor_x='center', anchor_y='bottom')

@window.event
def on_draw():
    window.clear()
    label.draw()


pyglet.app.run()