title: How do you update labels with grid geometry in Python tkinter?
body: <p>I have a problem with a GUI I created, that includes a label that indicates that the program is working in the background, the real script processes a huge amount of data so I want that indicator to tell the user it is indeed doing something. It worked fine so far like this, displaying "Idle" at script start, "running" while the function runs its course, and "Done" when it's done. (code is only the relevant part):</p>
  
  <pre><code>from tkinter import*
  
  def make_pause_function(sleepytime):
      import time
      print("Falling asleep")
      time.sleep(sleepytime)
      print("Awakening")
  
  class MyGUI:
  
     def __init__(self):
      self.__mainWindow = Tk()
      self.header = StringVar()
      self.header.set(3)
      self.labelText = 'Idle'
  #    self.Button2 = Button(text = "Sleep for X seconds!", command = self.run_main_script).grid(row=1,column=0)
  #    self.Entry2 = Entry(self.__mainWindow, textvariable=self.header, width = 100).grid(row=2,column=0)
  #    self.Label3 = Label(self.__mainWindow, text = self.labelText).grid(row=3,column=0)
  
      self.Button2 = Button(text = "Sleep for X seconds!", command = self.run_main_script)
      self.Entry2 = Entry(self.__mainWindow, textvariable=self.header, width = 100)
      self.Label3 = Label(self.__mainWindow, text = self.labelText)
  
      self.Button2.pack()
      self.Entry2.pack()
      self.Label3.pack()
  
      mainloop()
  
     def run_main_script(self):
      self.Label3["text"] = 'running'
      self.__mainWindow.update_idletasks()
      header=self.header.get()
      make_pause_function(int(header))
      self.Label3["text"] = 'done'
      self.__mainWindow.update_idletasks()
  
  myGUI = MyGUI()
  </code></pre>
  
  <p>But when the GUI grew because of many options, I switched from pack to grid geometry manager and then the label updating I had gotten working after a lot of trial and error got broken again. The follwing code doesn't work:</p>
  
  <pre><code>from tkinter import*
  
  def make_pause_function(sleepytime):
      import time
      print("Falling asleep")
      time.sleep(sleepytime)
      print("Awakening")
  
  class MyGUI:
  
     def __init__(self):
      self.__mainWindow = Tk()
      self.header = StringVar()
      self.header.set(3)
      self.labelText = 'Idle'
      self.Button2 = Button(text = "Sleep for X seconds!", command = self.run_main_script).grid(row=1,column=0)
      self.Entry2 = Entry(self.__mainWindow, textvariable=self.header, width = 100).grid(row=2,column=0)
      self.Label3 = Label(self.__mainWindow, text = self.labelText).grid(row=3,column=0)
  
  #    self.Button2 = Button(text = "Sleep for X seconds!", command = self.run_main_script)
  #    self.Entry2 = Entry(self.__mainWindow, textvariable=self.header, width = 100)
  #    self.Label3 = Label(self.__mainWindow, text = self.labelText)
  
  #    self.Button2.pack()
  #    self.Entry2.pack()
  #    self.Label3.pack()
  
      mainloop()
  
     def run_main_script(self):
      self.Label3["text"] = 'running'
      self.__mainWindow.update_idletasks()
      header=self.header.get()
      make_pause_function(int(header))
      self.Label3["text"] = 'done'
      self.__mainWindow.update_idletasks()
  
  myGUI = MyGUI()
  </code></pre>
  
  <p>Seems that update_idletasks doesn't like grid. But I don't like pack for a GUI with lots of buttons and fields. Any way to do what I want with grid packing?</p>