Pythonのバッチは、画像の名前を変更します

import os
from random import Random

def random_str():
    randomlength=32
    str = ''
    chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789'
#     chars='abcdefghijklmnopqrstuvwxyz0123456'
    length = len(chars) - 1
    random = Random()
    for i in range(randomlength):
        str+=chars[random.randint(0, length)]
    return str
def NB():
    outer_path = 'F:\\sizaif\\wallpaper'
    folderlist = os.listdir(outer_path)  # 列举文件夹
    for folder in folderlist:
        inner_path = os.path.join(outer_path, folder)
        total_num_folder = len(folderlist)  # 文件夹的总数
        print("total have %d folders" % (total_num_folder))
        filelist = os.listdir(inner_path)  # 列举图片
        i = 0
        for item in filelist:
            total_num_file = len(filelist)  # 单个文件夹内图片的总数
            if item.endswith('.jpg'):
                src = os.path.join(os.path.abspath(inner_path), item)  # 原图的地址
                dst = os.path.join(os.path.abspath(inner_path), str(random_str()) + '.jpg')
                # 新图的地址（这里可以把str(folder) + '_' + str(i) + '.jpg'改成你想改的名称）
                try:
                    os.rename(src, dst)
                    print
                    'converting %s to %s ...' % (src, dst)
                    i += 1
                except:
                    continue
            elif item.endswith('.png'):
                src = os.path.join(os.path.abspath(inner_path), item)  # 原图的地址
                dst = os.path.join(os.path.abspath(inner_path), str(random_str()) + '.png')
                # 新图的地址（这里可以把str(folder) + '_' + str(i) + '.jpg'改成你想改的名称）
                try:
                    os.rename(src, dst)
                    print
                    'converting %s to %s ...' % (src, dst)
                    i += 1
                except:
                    continue
        print("/////////////////////////////////////////////*****")
        print(inner_path+" has done !!!")
if __name__ == '__main__':
    NB()