content: """Module replicating the qutip_qtrl package from within qutip."""
  import sys
  
  try:
      import qutip_qtrl
      del qutip_qtrl
      sys.modules["qutip.control"] = sys.modules["qutip_qtrl"]
  except ImportError:
      raise ImportError(
          "Importing 'qutip.control' requires the 'qutip_qtrl' package. "
          "Install it with `pip install qutip-qtrl` (for more details, go to "
          "https://qutip-qtrl.readthedocs.io/)."
      )
  