check file encoding

from tkinter import *
import chardet
import os
import wave
import sys

rootDir = './'
fileExt = '.py'
fileCount = 0

def traversal():
    global rootDir
    global fileCount

    for dirName, subdirList, fileList in os.walk(rootDir):
    #   print('Found directory: %s' % dirName)
        for fname in fileList:
            if fname.endswith(fileExt):
                f = open(rootDir + fname, 'rb')
                buf = f.read()
                f.close()

                r = chardet.detect(buf)
                encoding = r['encoding'].lower()
                if encoding.find('utf-8') == -1:
                    print("%s \t: %s" % (fname, encoding))
                    fileCount = fileCount + 1
                del r

traversal()