请python大神看看我这个代码是哪里出错了

#coding:utf8
import os
import cv2.cv as cv
import cv2
# 遍历指定目录，显示目录下的所有文件名
width_scale = 128 #缩放尺寸宽度
height_scale = 128#缩放尺寸高度
write_path = "F:/all_data/1/"#要写入的图片路径

#遍历每一张图片进行处理

def eachFile(filepath):
    pathDir =  os.listdir(filepath)
    for allDir in pathDir:
        child = os.path.join('%s%s' % (filepath,allDir))
    write_child = os.path.join('%s%s' % (write_path,allDir))
    image = cv.LoadImage(child,0)
    des_image = cv.CreateImage((width_scale,height_scale),image.depth,1)
    cv.Resize(image,des_image,cv2.INTER_AREA)
#    cv.ShowImage('afe',des_image)
    cv.SaveImage(write_child,des_image)
#    break
if __name__ == '__main__':
     filePathC = "F:/all_data/train/"
     eachFile(filePathC)

运行了以后，就只处理了train文件夹的最后一张图片，请问是哪里出了问题呢