Parse annotations from a pdf

Just in case somebody is looking for some working code.
Here is a script I use.

import poppler
import sys
import urllib
import os

def main():
  input_filename = sys.argv[1]
    # http://blog.hartwork.org/?p=612
  document = poppler.document_new_from_file('file://%s' % \
    urllib.pathname2url(os.path.abspath(input_filename)), None)
  n_pages = document.get_n_pages()
  all_annots = 0

  for i in range(n_pages):
        page = document.get_page(i)
        annot_mappings = page.get_annot_mapping ()
        num_annots = len(annot_mappings)
        if num_annots > 0:
            for annot_mapping in annot_mappings:
                if  annot_mapping.annot.get_annot_type().value_name != 'POPPLER_ANNOT_LINK':
                    all_annots += 1
                    print('page: {0:3}, {1:10}, type: {2:10}, content: {3}'.format(i+1, annot_mapping.annot.get_modified(), annot_mapping.annot.get_annot_type().value_nick, annot_mapping.annot.get_contents()))
    
  if all_annots > 0:
    print(str(all_annots) + " annotation(s) found")
  else:
    print("no annotations found")

if __name__ == "__main__":
    main()