My code is trying to get double word from multube files but give errore please help

import __future__
import Tkinter as tk
import os, glob
import sys
import string
import re
import tkFileDialog      
def most_frequant_word():
 browser= tkFileDialog.askdirectory()
 word_freq={}
 word_freq1={}
 count11=0
 for root, dirs, files in os.walk(browser):
    text1.insert(tk.INSERT, 'Found %d dirs and %d files' % (len(dirs), len(files)))
    text1.insert(tk.INSERT, "\n")
    for idx, file in enumerate(files):
     ff = open (os.path.join(root, file), "r")
     text = ff.read ( )
     ff.close ( )
     word_list = text.split()
     my_list = text.split()
     count11=len(word_list)+count11
     text1.insert(tk.INSERT, "total number of tokens %s" % pair_list)
     text1.insert(tk.INSERT, "\n") 
     for ix, word in enumerate(word_list):
      word = word.lower()
      word = word.rstrip('.,/"\ -_;\[](){} ')
     # build the dictionary
      word1=word
      word1+= ' ' + word_list[ix+1]
      count = word_freq.get(word, 0)
      word_freq[word] = count + 1
      count1 = word_freq1.get(word1,0)
      word_freq1[word1] = count1 + 1
       # create a list of (freq, word) tuples
      freq_list = [(word,freq ) for freq,word  in word_freq.items()]
      freq_list1 = [(word1,freq1 ) for freq1,word1  in word_freq.items()]
       # sort the list by the first element in each tuple (default)
      freq_list.sort(reverse=True)
      freq_list1.sort(reverse=True)
     for n, tup in enumerate(freq_list1):
        text1.insert(tk.INSERT, "%s times: %s" % tup)
        text1.insert(tk.INSERT, "\n")

root = tk.Tk(className = " most_frequant_word")
# text entry field, width=width chars, height=lines text
v1 = tk.StringVar()
text1 = tk.Text(root, width=50, height=50, bg='green')
text1.pack()
# function listed in command will be executed on button click
button1 = tk.Button(root, text='Brows', command=most_frequant_word)
button1.pack(pady=5)
text1.focus()
root.mainloop()