AttributeError: 'Env' object has no attribute 'two_player_step'

[daanklijn]

I am trying to run play.py. But unfortunately I end up getting the error below. I believe this is due to the Env class not having a method called two_player_step. Is it possible to recover this method?

Traceback (most recent call last):
  File "play.py", line 122, in <module>
    ani = animation.FuncAnimation(fig, updatefig, interval=20, blit=True)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 1656, in __init__
    TimedAnimation.__init__(self, fig, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 1416, in __init__
    *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 945, in __init__
    self._setup_blit()
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 1249, in _setup_blit
    self._post_draw(None, self._blit)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 1202, in _post_draw
    self._fig.canvas.draw_idle()
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/backend_bases.py", line 2012, in draw_idle
    self.draw(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/backends/backend_agg.py", line 407, in draw
    self.figure.draw(self.renderer)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/figure.py", line 1870, in draw
    self.canvas.draw_event(renderer)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/backend_bases.py", line 1759, in draw_event
    self.callbacks.process(s, event)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/cbook/__init__.py", line 229, in process
    self.exception_handler(exc)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/cbook/__init__.py", line 81, in _exception_printer
    raise exc
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/cbook/__init__.py", line 224, in process
    func(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 959, in _start
    self._init_draw()
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 1703, in _init_draw
    self._draw_frame(next(self.new_frame_seq()))
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/animation.py", line 1726, in _draw_frame
    self._drawn_artists = self._func(framedata, *self._args)
  File "play.py", line 102, in updatefig
    observation = env.two_player_step(player_a_action, player_b_action)[0][0]
AttributeError: 'Env' object has no attribute 'two_player_step'