text: from gym.envs.registration import register
  
  register(
      id='CartPoleContEnv-v0',
      entry_point='learn.envs.cartpole_continuous:CartPoleContEnv',
  )
  
  register(
      id='CrazyflieRigid-v0',
      entry_point='learn.envs.crazyflie_rigid:CrazyflieRigidEnv',
  )
  
  register(
      id='QuadEnv-v0',
      entry_point='learn.envs.model_continuous:QuadEnv',
  )
  
  register(
      id='DiscreteQuadEnv-v0',
      entry_point='learn.envs.model_discrete:DiscreteQuadEnv',
  )
  