glob.glob(file)
返回匹配的文件
glob.glob(./flower_photos/tulips/*.jpg) Out[1]:<br># ['./flower_photos/tulips/19425920580_cdc8f49aed_n.jpg', './flower_photos/tulips
/17094167287_865840060d_n.jpg', './flower_photos/tulips/8712282563_3819afb7bc.jpg',
'./flower_photos/tulips/7166606598_5d2cd307c3.jpg'']