本文实例讲述了python让图片按照exif信息里的创建时间进行排序的方法。分享给大家供大家参考。具体分析如下：
我们经常会从不同的设备里取出照片，比如照相机，手机，iphone等等，操作系统记录的创建日期经常 会因为拷贝等原因变动，下面的代码可以给图片按照exif里的创建时间进行排序，非常有用。
代码如下:
import os
import shutil
import image
from pil.exiftags import tags
def 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 = exif_data[306]
    if 36867 in exif_data and exif_data[36867]         mtime = exif_data[36867]
    if 36868 in exif_data and exif_data[36868]         mtime = exif_data[36868]
    return mtime
def 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 result
def 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)
希望本文所述对大家的python程序设计有所帮助。