def pipelines(self):
        """
        Property for accessing :class:`PipelineManager` instance, which is used to manage pipelines.

        :rtype: yagocd.resources.pipeline.PipelineManager
        """
        if self._pipeline_manager is None:
            self._pipeline_manager = PipelineManager(session=self._session)
        return self._pipeline_manager
Property for accessing :class:`PipelineManager` instance, which is used to manage pipelines.

        :rtype: yagocd.resources.pipeline.PipelineManager