title: Implement text-autocompletion in python/tkinter based text editor
body: <p>I would like to use an autocompletion algorithm in the main text window (not the Tkinter.entry - examples for this can be found) of this simple Tkinter text editor provided in the code box below. I thought the autocompletion algorithm of beeing dependent on a list of autocompleted words, i.e. as provided in the code example <a href="http://tkinter.unpythonic.net/wiki/AutocompleteEntry" rel="nofollow">[1]</a>.</p>
  
  <p>So far, I have found two code examples of autocompletion, one being for Tkinter with the use of an entry box [1] , the other beeing an external module for IDLE <a href="http://bugs.python.org/file6887/AutoComplete.py" rel="nofollow">[2]</a> (by Jerry King, ).</p>
  
  <p>So far, all my attempts to produce working code by moving elements of the [1] code into the text editor have failed. Note that I am quite new to Tkinter, and as such struggling with the whole framework as well</p>
  
  <pre><code># taken from http://www.java2s.com/Code/Python/GUI-Tk/SimpleEditor.htm
  
  
  from Tkinter import * 
  from tkSimpleDialog import askstring
  from tkFileDialog   import asksaveasfilename
  
  from tkMessageBox import askokcancel          
  
  class Quitter(Frame):                        
      def __init__(self, parent=None):          
          Frame.__init__(self, parent)
          self.pack()
          widget = Button(self, text='Quit', command=self.quit)
          widget.pack(expand=YES, fill=BOTH, side=LEFT)
      def quit(self):
          ans = askokcancel('Verify exit', "Really quit?")
          if ans: Frame.quit(self)
  
  
  class ScrolledText(Frame):
      def __init__(self, parent=None, text='', file=None):
          Frame.__init__(self, parent)
          self.pack(expand=YES, fill=BOTH)               
          self.makewidgets()
          self.settext(text, file)
      def makewidgets(self):
          sbar = Scrollbar(self)
          text = Text(self, relief=SUNKEN)
          sbar.config(command=text.yview)                  
          text.config(yscrollcommand=sbar.set)           
          sbar.pack(side=RIGHT, fill=Y)                   
          text.pack(side=LEFT, expand=YES, fill=BOTH)     
          self.text = text
      def settext(self, text='', file=None):
          if file: 
              text = open(file, 'r').read()
          self.text.delete('1.0', END)                   
          self.text.insert('1.0', text)                  
          self.text.mark_set(INSERT, '1.0')              
          self.text.focus()                                
      def gettext(self):                               
          return self.text.get('1.0', END+'-1c')         
  
  
  
  class SimpleEditor(ScrolledText):                        
      def __init__(self, parent=None, file=None): 
          frm = Frame(parent)
          frm.pack(fill=X)
          Button(frm, text='Open',  command=self.onSave).pack(side=LEFT)
          Button(frm, text='Save',  command=self.onSave).pack(side=LEFT)
          Button(frm, text='Cut',   command=self.onCut).pack(side=LEFT)
          Button(frm, text='Paste', command=self.onPaste).pack(side=LEFT)
          Button(frm, text='Find',  command=self.onFind).pack(side=LEFT)
          Quitter(frm).pack(side=LEFT)
          ScrolledText.__init__(self, parent, file=file) 
          self.text.config(font=('courier', 8, 'normal'))
      def Open(self):
          pass
      def onSave(self):
          filename = asksaveasfilename()
          if filename:
              alltext = self.gettext()                      
              open(filename, 'w').write(alltext)          
      def onCut(self):
          text = self.text.get(SEL_FIRST, SEL_LAST)        
          self.text.delete(SEL_FIRST, SEL_LAST)           
          self.clipboard_clear()              
          self.clipboard_append(text)
      def onPaste(self):                                    
          try:
              text = self.selection_get(selection='CLIPBOARD')
              self.text.insert(INSERT, text)
          except TclError:
              pass                                      
      def onFind(self):
          target = askstring('SimpleEditor', 'Search String?')
          if target:
              where = self.text.search(target, INSERT, END)  
              if where:                                    
                  print where
                  pastit = where + ('+%dc' % len(target))   
                 #self.text.tag_remove(SEL, '1.0', END)     
                  self.text.tag_add(SEL, where, pastit)     
                  self.text.mark_set(INSERT, pastit)         
                  self.text.see(INSERT)                    
                  self.text.focus()
  
  
  
  if __name__ == '__main__':
      try:
          SimpleEditor(file=sys.argv[1]).mainloop()   
      except IndexError:
          SimpleEditor().mainloop()                  
  </code></pre>