title: python tkinter how to bind key to a button
body: <p>New to programming and especially python and tKinter. How can I create a way to bind the key "s" to the button or the function <code>sharpen</code>? Any help would be awesome.    </p>
  
  <pre><code>from Tkinter import *
  from PIL import Image, ImageTk, ImageFilter, ImageEnhance
  
  class Application(Frame):
      def __init__(self, master=None):
          Frame.__init__(self, master)
          master.wm_title("Image examples")
          self.pack()
          self.createWidgets()
  
  def createWidgets(self):
      self.img = Image.open("lineage.jpg")
      self.photo1 = ImageTk.PhotoImage(self.img.convert("RGB"))
      self.label1 = Label(self, image=self.photo1)
      self.label1.grid(row=0, column=0, padx=5, pady=5, rowspan=10)
  
      self.photo2 = ImageTk.PhotoImage(self.img.convert("RGB"))
      self.label2 = Label(self, image=self.photo2)
      self.label2.grid(row=0, column=1, padx=5, pady=5, rowspan=10)
  
      button5 = Button(self, text="Sharpen", command=self.sharpen)
      button5.grid(row=4, column= 2, sticky = N)
  
  def sharpen(self):
      img2 = self.img.filter(ImageFilter.SHARPEN)
      self.photo2 = ImageTk.PhotoImage(img2)
      self.label2 = Label(self, image=self.photo2)
      self.label2.grid(row=0, column=1, padx=5, pady=5, rowspan=10)
  </code></pre>