title: Unwanted brackets {} in tkinter GUI
body: <p>the code is</p>
  
  <pre><code>from tkinter import * # Import tkinter
  
  class ChangeLabel:
  
      def __init__(self):
  
          window = Tk() # Create a window 
          window.title("Change Label Demo") # Set a title
  
          # Add a label to frame1
          frame1 = Frame(window) # Create and add a frame to window 
          frame1.pack()        
          self.lbl = Label(frame1, text = "No distance entered yet")
          self.lbl.pack()
  
          # Add a label, an entry, and a button to frame2
          frame2 = Frame(window) # Create and add a frame to window 
          frame2.pack()
          label = Label(frame2, text = "Enter a distance in kilometres:")
          self.msg = StringVar()
          entry = Entry(frame2, textvariable = self.msg) # Create entry
          btChangeText = Button(frame2, text = "Convert", 
              command = self.processButton) # Button callback method
  
          label.grid(row = 1, column = 1)
          entry.grid(row = 1, column = 2)
          btChangeText.grid(row = 1, column = 3)
  
          window.mainloop() # Create an event loop
  
  
      def processButton(self):
          calc = float(self.msg.get()) * 0.6214
  
          self.lbl["text"] = self.msg.get(), "Kilometres is", "%.2f" %calc, "miles"
  
  ChangeLabel() # Create GUI 
  </code></pre>
  
  <p>in the out put when you put in a number the output says </p>
  
  <pre><code>"20 {kilometres is} 12.43 miles"
  </code></pre>
  
  <p>how do I remove the {}?</p>