code: def active(self):
          
  
          task = self._get_task()
          if not task:
              return super(AsyncioScopeManager, self).active
  
          return self._get_task_scope(task)
docs: Return the currently active :class:`~opentracing.Scope` which
          can be used to access the currently active
          :attr:`Scope.span`.
  
          :return: the :class:`~opentracing.Scope` that is active,
              or ``None`` if not available.