python让图片按照exif信息里的创建时间进行排序，,import osimp

python让图片按照exif信息里的创建时间进行排序，,import osimp

import osimport shutilimport Imagefrom PIL.ExifTags import TAGS# code from http://www.byrx.netdef print_all_known_exif_tags():    for k in sorted(TAGS):        print k, TAGS[k]def print_all_exif_tags(image):    try:        img = Image.open(image)    except Exception, e:        print image, "skipping due to", e    else:        xf = img._getexif()        for tag in xf:            print TAGS.get(tag), xf[tag]    finally:        print 'done'def get_minimum_creation_time(exif_data):    mtime = "?"    if 306 in exif_data and exif_data[306] < mtime: # 306 = DateTime        mtime = exif_data[306]    if 36867 in exif_data and exif_data[36867] < mtime: # 36867 = DateTimeOriginal        mtime = exif_data[36867]    if 36868 in exif_data and exif_data[36868] < mtime: # 36868 = DateTimeDigitized        mtime = exif_data[36868]    return mtimedef get_creationdate_with_filename_as_dict(list_of_folders):    print "Processing all image files in:"    result = {}    for folder in list_of_folders:        print "- " + folder        counter = 0        for f in os.listdir(folder):            counter += 1            fullFileName = folder + "\\" + f            try:                img = Image.open(fullFileName)            except Exception, e:                print "    Skipping '%s' due to exception: %s"%(f, e)                continue            mtime = get_minimum_creation_time(img._getexif())            i = 0            while mtime+"_"*i in result:                i += 1            mtime = mtime+"_"*i            result[mtime] = fullFileName        print "  Found %s orignal files in %s."%(counter, folder)    print "Added total of %s to dictionary."%len(result)    return resultdef copy_from_image_dict_to_directory(image_dict, output_dir):    assert os.path.exists(output_dir)    for i,key in enumerate(sorted(image_dict)):        dummy, extension =  os.path.splitext(image_dict[key])        new_file_name = key.replace(":", "-") + extension        output_file = output_dir + new_file_name        shutil.copy2(image_dict[key], output_file)    print "Copied %s files to %s"%(i+1, output_dir)if __name__=="__main__":    source_dir = "/var/tmp/images"    output_dir = "/var/tmp/output"    # obtain /var/tmp/images/iPhone, /var/tmp/images/CanonPowerShot, /var/tmp/images/Nikon1    list_of_folders = [source_dir + subfolder for subfolder in os.listdir(source_dir)]    all_files = get_creationdate_with_filename_as_dict(list_of_folders)    copy_from_image_dict_to_directory(all_files, output_dir)