求助！！！求改成遍历所有文件

# -*- coding: utf-8 -*-
import pytesseract
from pytesseract import *
from PIL import Image,ImageEnhance,ImageFilter
import os
import fnmatch
import re,time
import urllib, random
def getGray(image_file):
tmpls=[]
for h in range(0, image_file.size[1]):#h
for w in range(0, image_file.size[0]):#w
tmpls.append( image_file.getpixel((w,h)) )
return tmpls
def getAvg(ls):#获取平均灰度值
return sum(ls)/len(ls)
def getMH(a,b):#比较100个字符有几个字符相同
dist = 0;
for i in range(0,len(a)):
if a[i]==b[i]:
dist=dist+1
return dist
def getImgHash(fne):
image_file = Image.open(fne) # 打开
image_file=image_file.resize((12, 12))#重置图片大小我12px X 12px
image_file=image_file.convert("L")#转256灰度图
Grayls=getGray(image_file)#灰度集合
avg=getAvg(Grayls)#灰度平均值
bitls=''#接收获取0或1
#除去变宽1px遍历像素
for h in range(1, image_file.size[1]-1):#h
for w in range(1, image_file.size[0]-1):#w
if image_file.getpixel((w,h))>=avg:#像素的值比较平均值 大于记为1 小于记为0
bitls=bitls+'1'
else:
bitls=bitls+'0'
return bitls
a=getImgHash(".//testpic//1.jpg")#图片地址自行替换
b=getImgHash(".//testpic//4.jpg")
compare=getMH(a,b)
print (u'相似度'+str(compare)+'%')