if (element instanceof PythonNode) {
nodesSelected.add((PythonNode) element);
} else if (element instanceof PythonpathZipChildTreeNode) {
PythonpathZipChildTreeNode node = (PythonpathZipChildTreeNode) element;
if (node.isDir) {
containersSelected.add(node);
} else {
pythonPathZipFilesSelected.add(node);
}