情形1: 没有子目录:

def get_img_list(path):
    is_image_file = lambda x : any(x.endswith(extension) 
                                   for extension in ['.jpg', 'png', 'tif'])
    return [os.path.join(path, x) for x in os.listdir(path) if is_image_file(x)]

也可以使用glob方法,:

glob.glob(os.path.join(path, '*.jpg'))

情形2: 有子目录

def file_name(file_dir):   
    L=[]   
    is_image_file = lambda x : any(x.endswith(extension) for extension in ['.jpg', 'png', 'tif'])
    for root, dirs, files in os.walk(file_dir):  
        for file in files:  
            if is_image_file(file):
                L.append(os.path.join(root, file))  
    return L