title: How to update label on tkinter
body: <p>I would like to update a label once I press one of the buttons.
  Here is my code - I added a label (caled <code>label1</code>), now I have two issues:</p>
  
  <ol>
    <li>It presents some gibberish</li>
    <li>How do I update the label with text right when the user is pressing the Browse button?</li>
  </ol>
  
  <pre><code>from tkinter import *
  import threading
  
  class Window(Frame):
      def __init__(self, master=None):
          Frame.__init__(self, master)
          self.master = master
          self.init_window()
  
      def init_window(self):
          self.var = IntVar()
          self.master.title("GUI")
          self.pack(fill=BOTH, expand=1)
          quitButton = Button(self, text="Exit", command=self.client_exit)
          startButton = Button(self, text="Browse", command=self.start_Button)
          label1 = Label(self, text=self.lable_1)
  
          quitButton.grid(row=0, column=0)
          startButton.grid(row=0, column=2)
          label1.grid(row=1, column=0)
  
      def client_exit(self):
          exit()
  
      def lable_1(self):
          print('starting')
  
      def start_Button(self):
          def f():
              print('Program is starting')
          t = threading.Thread(target=f)
          t.start()
  
  root = Tk()
  root.geometry("250x50")
  app = Window(root)
  root.title("My Program")
  root.mainloop()
  </code></pre>