在Python中，在循环的同时移除列表指定元素的方法

    l=os.listdir() # 文件来自于vivo的阅图锁屏，其中有重复的四张图片，好在文件名就能找到规律，不需要再对文件本身进行分析，例如hash或size
    
    l=['PictureUnlock_general_operation_na_1222.pictureunlock.jpg',
     'PictureUnlock_general_operation_na_1226.pictureunlock.jpg',
     'PictureUnlock_general_operation_na_1233_user0.pictureunlock.jpg',
     'PictureUnlock_general_operation_na_1265_user0.pictureunlock.jpg',
     'PictureUnlock_s_103829_user0.pictureunlock.jpg',
     'PictureUnlock_s_137917_user0.pictureunlock.jpg',
     'PictureUnlock_s_140976.pictureunlock.jpg',
     'PictureUnlock_s_144145.pictureunlock.jpg',
     'PictureUnlock_