title: Utility of config() in python tkinter
body: <p>I have this python script, what is the use of <code>config()</code> in the python tkinter module?</p>
  
  <pre><code>from tkinter import *   
  root=Tk()
  def sel():
     s=v.get()
     if s=="m":
         l.config(text="CORRECT ANSWER!!!")
     else:
         l.config(text="WRONG ANSWER")
  v=StringVar()
  a=Label(root,text="Delhi is the capital of India.",bg="wheat",fg="blue")
  a.pack()
  r1=Radiobutton(root,text="True",variable=v,value="m",command=sel)
  r1.pack(anchor=W)
  r2=Radiobutton(root,text="False",variable=v,value="n",command=sel)
  r2.pack(anchor=W)
  l=Label(root,bg="ivory",fg="darkgreen")
  l.pack()
  root.mainloop()
  </code></pre>