old_contents: from . import mc
  import feedparser
  import hashlib
  import re
  
  
  class Feed(object):
  
      _PARAMS = frozenset([
          'author', 'author_detail', 'authors', 'generator', 'generator_detail',
          'image', 'itunes_explicit', 'language', 'link', 'links', 'publisher',
          'publisher_detail', 'rawvoice_frequency', 'rawvoice_rating', 'rights',
          'rights_detail', 'subtitle', 'subtitle_detail', 'summary',
          'summary_detail', 'sy_updatefrequency', 'sy_updateperiod', 'tags',
          'title', 'title_detail', 'updated', 'updated_parsed'
      ])
  
      def __init__(self, url=None, **kwargs):
          self.url = url
          if url is not None:
              self.parse_feed()
  
      @property
      def lookup(self):
          """
          :return: Dictionary lookup containing `{id: entry}`.
          :rtype: ``dict``
          """
          return {entry.entry_id: entry for entry in self.entries}
  
      def parse_feed(self):
          url_hash = hashlib.md5(self.url).hexdigest()
  
          d = mc.get(url_hash)
          if not d:
              d = feedparser.parse(self.url)
              mc.set(url_hash, d)
  
          feed_obj = d.feed
          for key in self._PARAMS:
              setattr(self, key, feed_obj.feed.pop(key))
              setattr(self, key, kwargs.get(key))
          self._custom_keys = feed_obj.feed
  
          self.entries = frozenset(Entry(**entry) for entry in d.entries)
  
  
  class Entry(object):
  
      _PARAMS = frozenset([
          'author', 'author_detail', 'authors', 'comments', 'content',
          'guidislink', 'id', 'itunes_duration', 'itunes_explicit', 'link',
          'links', 'published', 'published_parsed', 'slash_comments', 'subtitle',
          'subtitle_detail', 'summary', 'summary_detail', 'tags', 'title',
          'title_detail', 'wfw_commentrss'
      ])
  
      def __init__(self, **kwargs):
          for key in self._PARAMS:
              setattr(self, key, kwargs.get(key))
  
      @property
      def entry_id(self, link_regex=r'\d+$'):
          m = re.search(link_regex, self.id)
          return int(m.group())
  
      @property
      def audio(self):
          """
          :return href: URL of audio file for podcast.
          :rtype  href: ``str``
          """
          return filter(
              lambda x: x.get('rel') == 'enclosure', self.links).next().get(
                  'href')
  
new_contents: from . import mc
  import feedparser
  import hashlib
  import re
  
  
  class Feed(object):
  
      _PARAMS = frozenset([
          'author', 'author_detail', 'authors', 'generator', 'generator_detail',
          'image', 'itunes_explicit', 'language', 'link', 'links', 'publisher',
          'publisher_detail', 'rawvoice_frequency', 'rawvoice_rating', 'rights',
          'rights_detail', 'subtitle', 'subtitle_detail', 'summary',
          'summary_detail', 'sy_updatefrequency', 'sy_updateperiod', 'tags',
          'title', 'title_detail', 'updated', 'updated_parsed'
      ])
  
      def __init__(self, url=None, **kwargs):
          self.url = url
          if url is not None:
              self.parse_feed()
  
      @property
      def lookup(self):
          """
          :return: Dictionary lookup containing `{id: entry}`.
          :rtype: ``dict``
          """
          return {entry.entry_id: entry for entry in self.entries}
  
      def parse_feed(self):
          url_hash = hashlib.md5(self.url).hexdigest()
  
          d = mc.get(url_hash)
          if not d:
              d = feedparser.parse(self.url)
              mc.set(url_hash, d)
  
          feed_obj = d.feed
          for key in self._PARAMS:
              setattr(self, key, feed_obj.feed.pop(key))
          self._custom_keys = feed_obj.feed
  
          self.entries = frozenset(Entry(**entry) for entry in d.entries)
  
  
  class Entry(object):
  
      _PARAMS = frozenset([
          'author', 'author_detail', 'authors', 'comments', 'content',
          'guidislink', 'id', 'itunes_duration', 'itunes_explicit', 'link',
          'links', 'published', 'published_parsed', 'slash_comments', 'subtitle',
          'subtitle_detail', 'summary', 'summary_detail', 'tags', 'title',
          'title_detail', 'wfw_commentrss'
      ])
  
      def __init__(self, **kwargs):
          for key in self._PARAMS:
              setattr(self, key, kwargs.get(key))
  
      @property
      def entry_id(self, link_regex=r'\d+$'):
          m = re.search(link_regex, self.id)
          return int(m.group())
  
      @property
      def audio(self):
          """
          :return href: URL of audio file for podcast.
          :rtype  href: ``str``
          """
          return filter(
              lambda x: x.get('rel') == 'enclosure', self.links).next().get(
                  'href')
  
subject: remove example code