title: Tkinter import filedialog error
body: <p>I'm trying to use tkinter with python3 to open an image, see here a piece of code :</p>
  
  <pre><code>#!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  # --- Python 3.4
  
  from PIL import Image
  import Tkinter as tk
  from Tkinter import filedialog
  import numpy as np
  import os
  var = 'n'
  
  # Importing the image to correct
  
  while var != 'o' :
      var = raw_input("Press \"o\" to open the image to correct\n")
      var = var.lower()
  root = tk.Tk()
  root.withdraw()
  path = filedialog.askopenfilename()
  image_test = Image.open(path)
  </code></pre>
  
  <p>I have installed python3-tk, and I have the demo window when I write</p>
  
  <pre><code>python3 -m tkinter 
  </code></pre>
  
  <p>in the terminal. I tried several combinations that did not work :</p>
  
  <pre><code>import tkinter as tk
  from tkinter import filedialog
  </code></pre>
  
  <p>gives </p>
  
  <pre><code>ImportError : No module named tkinter
  </code></pre>
  
  <p>,</p>
  
  <pre><code>import Tkinter as tk
  from Tkinter import filedialog    
  </code></pre>
  
  <p>gives </p>
  
  <pre><code>ImportError : cannot import name filedialog
  </code></pre>
  
  <p>I tried with _tinker , FileDialog, file_dialog, but I always have "ImportError : cannot import name filedialog". Any clue ?</p>