python让图片按照exif信息里的创建时间进行排序的方法

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: # 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 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。