Select multiple directories with PySide6

dirchooser.py

from pathlib import Path
from typing import Optional, List

from PySide6.QtWidgets import (
    QApplication, 
    QFileDialog, 
    QListView, 
    QAbstractItemView, 
    QTreeView, 
    QFileSystemModel
)

def choose_directories(base:Path = Path('.')) -> Optional[List[str]]:
    """
    Open a dialogue to select multiple directories

    Args:
        base (Path): Starting directory to show when opening dialogue

    Returns:
        List[str]: List of paths that were selected, ``None`` if "cancel" selected"

    References:
        Mildly adapted from https://stackoverflow.com/a/28548773
        to use outside an exising Qt Application
    """
    app = QApplication()
    file_dialog = QFileDialog()
    file_dialog.setOption(QFileDialog.Option.DontUseNativeDialog, True)
    file_dialog.setFileMode(QFileDialog.Directory)
    for widget_type in (QListView, QTreeView):
        for view in file_dialog.findChildren(widget_type):
            if isinstance(view.model(), QFileSystemModel):
                view.setSelectionMode(
                    QAbstractItemView.ExtendedSelection)

    if file_dialog.exec():
        paths = file_dialog.selectedFiles()
        return paths

if __name__ == "__main__":
    paths = choose_directories()
    print(paths)