text: __author__ = 'yuwenhao'
  
  import gym
  import numpy as np
  import sys
  import gym.spaces
  
  if __name__ == '__main__':
      if len(sys.argv) > 1:
          env = gym.make(sys.argv[1])
      else:
          env = gym.make('DartWalker3dSPD-v1')
  
      env.env.disableViewer = False
  
      env.reset()
  
  
      for i in range(1000):
          env.step(env.action_space.sample())
          env.render()
  
      env.close()