code: def make_instance(self, command):
          
          ist = lib.EnvMakeInstance(self._env, command.encode())
          if ist == ffi.NULL:
              raise CLIPSError(self._env)
  
          return Instance(self._env, ist)
docs: Create and initialize an instance of a user-defined class.
  
          command must be a string in the form:
  
          (<instance-name> of <class-name> <slot-override>*)
          <slot-override> :== (<slot-name> <constant>*)
  
          Python equivalent of the CLIPS make-instance command.