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import tkinter as tk
from tkinter import filedialog
import os

app_win = tk.Tk()
app_win.withdraw()

# select a folder
folder_path = filedialog.askdirectory(parent=app_win)
if folder_path:
    pass
else: # if no folder was chosen, askdirectory return null str
    raise SystemExit('No folder chosen')

# selsect a single file
file_path = filedialog.askopenfilename(parent=app_win)

# select one or more flles, return a tuple
files_tuple = filedialog.askopenfilenames(parent=app_win)