Python实例1-读取指定文件夹下指定类型的图片名，打乱后输出txt

import randomimport os   def file_name(file_dir):       L=[]       for root, dirs, files in os.walk(file_dir):          for file in files:              if os.path.splitext(file)[1] == '.jpg':                  #L.append(os.path.join(root, file))                L.append(file)    return Lmy_filename=file_name('D:\\Images')random.shuffle(my_filename)f=open('demo.txt','w')for i in my_filename:    #k=' '.join([str(j) for j in i])    f.write(i+"\n")f.close()