Python3 thumby folder selector. In GTK.

selector.py

import os
from gi.repository import Gtk

path_to_file = {}

def getDirs(path, parent_item, tree_data_store):
	if os.path.exists(path):
		for file in os.listdir(path):
			filepath = os.path.join(path, file)
			if os.path.isdir(filepath):
				item = tree_data_store.append(parent_item, [file])
				path = tree_data_store.get_path(item)
				path_to_file[str(path)] = filepath
				getDirs(filepath, item, tree_data_store)

def getDirsWithoutRootFolder(path, tree_data_store):
	if os.path.exists(path):
		for file in os.listdir(path):
			filepath = os.path.join(path, file)
			if os.path.isdir(filepath):
				getDirs(filepath, None, tree_data_store)
				
def genFileTree():
	tree_data_store = Gtk.TreeStore(str)
	internal_item = tree_data_store.append(None, ["Internal Storage"])
	path = tree_data_store.get_path(internal_item)
	path_to_file[str(path)] = None

	getDirsWithoutRootFolder("/run/media", tree_data_store)
	getDirsWithoutRootFolder("/media", tree_data_store)
	return tree_data_store
	
tree_data_store = genFileTree()

win = Gtk.Window()
win.connect("delete-event", Gtk.main_quit)

def init_dialog():
	tree_data_store = genFileTree()
	tree_view = Gtk.TreeView(tree_data_store)
	renderer = Gtk.CellRendererText()
	column = Gtk.TreeViewColumn("Media Folders", renderer, text=0)
	tree_view.append_column(column)

	folder_dialog = Gtk.Dialog("Chose a folder")
	folder_dialog.add_button("Use selected folder", 13)
	folder_dialog.get_content_area().add(tree_view)
	folder_dialog.get_content_area().show_all()
	return folder_dialog, tree_view

b = Gtk.Button("Chose External Device")
def on_select_file(button):
	folder_dialog, tree_view = init_dialog()
	dialog_responce = folder_dialog.run()
	if dialog_responce == 13:
		tree_sel = tree_view.get_selection()
		(tree_store, ti) = tree_sel.get_selected()
		ids = tree_store.get_path(ti)
		print(path_to_file[str(ids)])
	folder_dialog.destroy()
b.connect("clicked", on_select_file)

win.add(b)
win.show_all()
Gtk.main()