code: def requires_refcount(cls, func):
          
          @functools.wraps(func)
          def requires_active_handle(*args, **kwargs):
              if cls.refcount() == 0:
                  raise NoHandleException()  # You probably want to encase your code in a 'with LibZFSHandle():' block...
              return func(*args, **kwargs)
          return requires_active_handle
docs: The ``requires_refcount`` decorator adds a check prior to call ``func`` to verify
          that there is an active handle. if there is no such handle, a ``NoHandleException`` exception is thrown.