python - how to create folder view in pyqt inside main window

Question

I'm trying to implement a folder viewer to view the structure of a specific path. and this folder view should look like a the tree widget in PyQT , i know that the file dialog can help , but i need to have it inside my main window.
i tried to implement this using QTreeWidget and i used a recursed function to loop inside folders, but this is too slow. since it needs to recurse around huge number of folders. is this the right way to do it? or there is a ready qt solution for this problem.
Check the figure below.

Answer 1

for PyQt5 I did this function :

def load_project_structure(startpath, tree):
    """
    Load Project structure tree
    :param startpath: 
    :param tree: 
    :return: 
    """
    import os
    from PyQt5.QtWidgets import QTreeWidgetItem
    from PyQt5.QtGui import QIcon
    for element in os.listdir(startpath):
        path_info = startpath + "/" + element
        parent_itm = QTreeWidgetItem(tree, [os.path.basename(element)])
        if os.path.isdir(path_info):
            load_project_structure(path_info, parent_itm)
            parent_itm.setIcon(0, QIcon('assets/folder.ico'))
        else:
            parent_itm.setIcon(0, QIcon('assets/file.ico'))

then i call it like this :

 load_project_structure("/your/path/here",projectTreeWidget)

and i have this result :