title: Getting a value from Tkinter OptionMenu in Python
body: <p>I'm trying to print out the value selected in the option menu but only the first value gets printed everytime I run the code, even if I change my selection to b or c. Not sure where I'm wrong.This is my code:</p>
  
  <pre><code>from tkinter import *
  window=Tk()
  window.geometry("700x400")
  
  options=StringVar(window)
  options.set("a")
  menu=OptionMenu(window,options, "a","b","c")
  menu.grid(row=2,column=2)
  selection=options.get()
  print(selection)
  </code></pre>