exif-py是一个纯python实现的获取图片元数据的python库，官方下载地址：
http://exif-py.svn.sourceforge.net/viewvc/exif-py/source/EXIF.py?revision=19&view=markup

# library test/debug function (dump given files)  if __name__ == '__main__':      import sys      import getopt         # parse command line options/arguments      try:          opts, args = getopt.getopt(sys.argv[1:], "hqsdt:v", ["help", "quick", "strict", "debug", "stop-tag="])      except getopt.GetoptError:          usage(2)      if args == []:          usage(2)      detailed = True      stop_tag = 'UNDEF'      debug = False      strict = False      for o, a in opts:          if o in ("-h", "--help"):              usage(0)          if o in ("-q", "--quick"):              detailed = False          if o in ("-t", "--stop-tag"):              stop_tag = a          if o in ("-s", "--strict"):              strict = True          if o in ("-d", "--debug"):              debug = True         # output info for each file      for filename in args:          try:              file=open(filename, 'rb')          except:              print "'%s' is unreadable\n"%filename              continue          print filename + ':'          # get the tags          data = process_file(file, stop_tag=stop_tag, details=detailed, strict=strict, debug=debug)          if not data:              print 'No EXIF information found'              continue             x=data.keys()          x.sort()          for i in x:              if i in ('JPEGThumbnail', 'TIFFThumbnail'):                  continue              try:                  print '   %s (%s): %s' % \                        (i, FIELD_TYPES[data[i].field_type][2], data[i].printable)              except:                  print 'error', i, '"', data[i], '"'          if 'JPEGThumbnail' in data:              print 'File has JPEG thumbnail'          print