Using a Treeview (python, tkinter)

import os
import threading
from tkinter import *
from tkinter import ttk
from tkinter.filedialog import askdirectory


def search_files(patron, folder):
    todo = os.walk(folder)
    for base_dir, dirs, files in todo:
        for file in files:
            if patron in file:
                yield((file, base_dir))


class MainWindow(Frame):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.master.title('File searcher...')
        self.columnconfigure((1), weight=1)
        self.rowconfigure(2, weight=1)
        self.make_widgets()

    def make_widgets(self):
        self.search_folder_label = ttk.Label(self, text='Carpeta (folder):')
        self.search_folder_entry = ttk.Entry(self)
        self.search_folder_button = ttk.Button(self, text='Elejir Carpeta (choose folder)', command=self.ask_open_folder_name)

        self.search_label = ttk.Label(self, text='Búsqueda (pattern):')
        self.search_entry = ttk.Entry(self)
        self.search_button = ttk.Button(self, text='Buscar (search)', command=self.search)
        # table (Treeview) and scrollbars
        self.vbar = ttk.Scrollbar(self)
        self.vbar.grid(row=2, column=3, sticky='ns')
        self.columns = ('archivo', 'carpeta')
        self.search_results_table = ttk.Treeview(self)
        self.search_results_table.config(show='headings', columns=self.columns)
        self.search_results_table.heading('archivo', text='Archivo (File)')
        self.search_results_table.heading('carpeta', text='Carpeta (Folder)')
        self.vbar.config(command=self.search_results_table.yview)
        self.search_results_table.config(yscrollcommand=self.vbar.set)

        self.search_folder_label.grid(row=0, column=0)
        self.search_folder_entry.grid(row=0, column=1, sticky='ew')
        self.search_folder_button.grid(row=0, column=2, sticky='ew')
        self.search_label.grid(row=1, column=0)
        self.search_entry.grid(row=1, column=1, sticky='ew')
        self.search_button.grid(row=1, column=2, sticky='ew')
        self.search_results_table.grid(row=2, column=0, columnspan=3, sticky='nsew')

    def ask_open_folder_name(self):
        folder = askdirectory(title='Elija una carpeta')
        self.search_folder_entry.delete(0, END)
        self.search_folder_entry.insert(0, folder)

    def search(self):
        self.th1 = threading.Thread(target=self.search_func)
        self.th1.start()

    def search_func(self):
        folder = self.search_folder_entry.get()
        patron = self.search_entry.get()
        children = self.search_results_table.get_children()
        if children:
            self.search_results_table.delete(*children)
        if folder and patron:
            for resultado in search_files(patron, folder):
                self.search_results_table.insert('', 0, values=resultado)


def main():
    root = Tk()
    w = MainWindow(root)
    w.pack(expand=YES, fill=BOTH)
    root.mainloop()


if __name__ == '__main__':
    main()