code: def import_cvxpy():
      
      global _CVXPY_ERROR_LOGGED
      try:
          import cvxpy
      except ImportError:  # pragma no coverage
          cvxpy = None
          if not _CVXPY_ERROR_LOGGED:
              _log.error("Could not import cvxpy. Tomography tools will not function.")
              _CVXPY_ERROR_LOGGED = True
      return cvxpy
docs: Try importing the qutip module, log an error if unsuccessful.
  
      :return: The cvxpy module if successful or None
      :rtype: Optional[module]