def __init__(self, env, skip=4):
    'Return only every `skip`-th frame'
    gym.Wrapper.__init__(self, env)
    self._obs_buffer = np.zeros(((2,) + env.observation_space.shape), dtype=np.uint8)
    self._skip = skip
Return only every `skip`-th frame
def __init__(self, env, skip=4):
    
    gym.Wrapper.__init__(self, env)
    self._obs_buffer = np.zeros(((2,) + env.observation_space.shape), dtype=np.uint8)
    self._skip = skip