How to list all files in a listbox, subdirs included

You can now use the ListFile class, previously called FileList, to get a list of file with a certain extension in a listbox in tkinter. Now you can also, with the argumenti subdirs=1, have all the files, with absolute path too, also in the subdirectories, not also in the root folder.

Here is the code:

"""
How to make a GUI with Tkinter to open mp4 videos in a folder

"""

from glob import glob
import tkinter as tk
import sys
import os


class ListFile:
    def __init__(self, filetype, diroot=".", subdirs=0):
        self.folder = os.path.abspath(diroot)
        self.filetype = filetype
        self.root = tk.Tk()
        self.root.geometry("400x800")
        self.lb = tk.Listbox(self.root)
        self.lb.configure(bg="gold")
        self.lb.pack(fill="both", expand=True)
        self.ListFile = glob("*." + self.filetype)
        if subdirs:
            self.find_all()
        else:
            self.find()
        self.root.mainloop()

    def find_all(self):
        # def searchfiles(extension='.txt', folder='H:\\'):
        for r, d, f in os.walk(self.folder):
            for file in f:
                if file.endswith(self.filetype):
                    self.lb.insert(0, r + "\\" + file)

    def find(self):
        """ insert all files in the listbox """
        for f in self.filelist:
            self.lb.insert(0,f)


if __name__ == '__main__':
    ListFile("txt", subdirs=1)