old_contents: #!/usr/bin/env python
  # -*- coding: utf-8; -*-
  #
  # This file is part of Superdesk.
  #
  # Copyright 2013, 2014, 2015 Sourcefabric z.u. and contributors.
  #
  # For the full copyright and license information, please see the
  # AUTHORS and LICENSE files distributed with this source code, or
  # at https://www.sourcefabric.org/superdesk/license
  
  from superdesk.io.feed_parsers.nitf import NITFFeedParser
  from superdesk.io import register_feed_parser
  
  
  class PAFeedParser(NITFFeedParser):
      """
      NITF Parser extension for Press Association, it maps the category meta tag to an anpa category
      """
      NAME = 'pa_nitf'
  
      def _category_mapping(self, elem):
          """
          Map the category supplied by PA to a best guess anpa_category in the system
          :param elem:
          :return: anpa category list qcode
          """
          category = elem.get('content')[:1].upper()
          if category in ('S', 'R', 'F'):
              return [{'qcode': 'S'}]
          if category == 'Z':
              return [{'qcode': 'V'}]
          return [{'qcode': 'I'}]
  
      def __init__(self):
          self.MAPPING = {'anpa_category': {'xpath': "head/meta/[@name='category']", 'filter': self._category_mapping}}
          super().__init__()
  
  register_feed_parser(PAFeedParser.NAME, PAFeedParser())
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8; -*-
  #
  # This file is part of Superdesk.
  #
  # Copyright 2013, 2014, 2015 Sourcefabric z.u. and contributors.
  #
  # For the full copyright and license information, please see the
  # AUTHORS and LICENSE files distributed with this source code, or
  # at https://www.sourcefabric.org/superdesk/license
  
  from superdesk.io.feed_parsers.nitf import NITFFeedParser
  from superdesk.io import register_feed_parser
  
  
  class PAFeedParser(NITFFeedParser):
      """
      NITF Parser extension for Press Association, it maps the category meta tag to an anpa category
      """
      NAME = 'pa_nitf'
  
      def _category_mapping(self, elem):
          """
          Map the category supplied by PA to a best guess anpa_category in the system
          :param elem:
          :return: anpa category list qcode
          """
          if elem.get('content') is not None:
              category = elem.get('content')[:1].upper()
              if category in {'S', 'R', 'F'}:
                  return [{'qcode': 'S'}]
              if category == 'Z':
                  return [{'qcode': 'V'}]
          return [{'qcode': 'I'}]
  
      def __init__(self):
          self.MAPPING = {'anpa_category': {'xpath': "head/meta/[@name='category']", 'filter': self._category_mapping}}
          super().__init__()
  
  register_feed_parser(PAFeedParser.NAME, PAFeedParser())
  
subject: Use a set for comparison