How to convert stl/ply files to pcd files? no 'vtkPolyDataToPointCloud' function in pclpy.pcl.io

[CarrotC]

I want to sample CAD models in stl format, and find that stl can be convert to pcd files with pcl.
There is code in c++:

	//read CAD model in stl format
	vtkSmartPointer<vtkSTLReader> reader = vtkSmartPointer<vtkSTLReader>::New();
	reader->SetFileName("T0-2.stl");
	reader->Update();
	//convert to ply format
	vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
	polyData = reader->GetOutput();
	polyData->GetNumberOfPoints();
	pcl::PointCloud<pcl::PointXYZRGBA>::Ptr cloud(new pcl::PointCloud<pcl::PointXYZRGBA>());
	//ply to pcd
	pcl::io::vtkPolyDataToPointCloud(polyData, *cloud);
	//show point cloud
	pcl::visualization::PCLVisualizer visual("stl2pcd");
	visual.setBackgroundColor(255, 255, 255);
	visual.addPointCloud(cloud, "input_cloud");
	visual.spin();
	//save pcd file
	pcl::io::savePCDFileASCII("stl2pcd.pcd", *cloud);

When I rewrite these code in python with pclpy, I meet a problem that there is pcl::io::vtkPolyDataToPointCloud(polyData, *cloud); in c++ code, but there is no vtkPolyDataToPointCloud function or sth like this in pclpy.pcl.io.
Is it a bug or is there other parts in pclpy that can get the same result?