code: def container_running(self, container_name):
          
          filters = {
              "name": container_name,
              "status": "running",
          }
  
          for container in self.client.containers.list(filters=filters):
              if container_name == container.name:
                  return container
          return None
docs: Finds out if a container with name ``container_name`` is running.
  
          :return: :class:`Container <docker.models.containers.Container>` if it's running, ``None`` otherwise.
          :rtype: Optional[docker.models.container.Container]