How to use the feedgenerator.django.utils.encoding.force_text function in feedgenerator

def __init__(self, title, link, description, language=None, author_email=None,
            author_name=None, author_link=None, subtitle=None, categories=None,
            feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs):
        to_unicode = lambda s: force_text(s, strings_only=True)
        if categories:
            categories = [force_text(c) for c in categories]
        if ttl is not None:
            # Force ints to unicode
            ttl = force_text(ttl)
        self.feed = {
            'title': to_unicode(title),
            'link': iri_to_uri(link),
            'description': to_unicode(description),
            'language': to_unicode(language),
            'author_email': to_unicode(author_email),
            'author_name': to_unicode(author_name),
            'author_link': iri_to_uri(author_link),
            'subtitle': to_unicode(subtitle),
            'categories': categories or (),
            'feed_url': iri_to_uri(feed_url),
            'feed_copyright': to_unicode(feed_copyright),
            'id': feed_guid or link,

def add_item(self, title, link, description, author_email=None,
        author_name=None, author_link=None, pubdate=None, comments=None,
        unique_id=None, enclosure=None, categories=(), item_copyright=None,
        ttl=None, content=None, updateddate=None, **kwargs):
        """
        Adds an item to the feed. All args are expected to be Python Unicode
        objects except pubdate and updateddate, which are datetime.datetime
        objects, and enclosure, which is an instance of the Enclosure class.
        """
        to_unicode = lambda s: force_text(s, strings_only=True)
        if categories:
            categories = [to_unicode(c) for c in categories]
        if ttl is not None:
            # Force ints to unicode
            ttl = force_text(ttl)
        item = {
            'title': to_unicode(title),
            'link': iri_to_uri(link),
            'description': to_unicode(description),
            'content': to_unicode(content),
            'author_email': to_unicode(author_email),
            'author_name': to_unicode(author_name),
            'author_link': iri_to_uri(author_link),
            'pubdate': pubdate,
            'updateddate': updateddate,
            'comments': to_unicode(comments),
            'unique_id': to_unicode(unique_id),
            'enclosure': enclosure,
            'categories': categories or (),
            'item_copyright': to_unicode(item_copyright),
            'ttl': ttl,

def __init__(self, title, link, description, language=None, author_email=None,
            author_name=None, author_link=None, subtitle=None, categories=None,
            feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs):
        to_unicode = lambda s: force_text(s, strings_only=True)
        if categories:
            categories = [force_text(c) for c in categories]
        if ttl is not None:
            # Force ints to unicode
            ttl = force_text(ttl)
        self.feed = {
            'title': to_unicode(title),
            'link': iri_to_uri(link),
            'description': to_unicode(description),
            'language': to_unicode(language),
            'author_email': to_unicode(author_email),
            'author_name': to_unicode(author_name),
            'author_link': iri_to_uri(author_link),
            'subtitle': to_unicode(subtitle),
            'categories': categories or (),
            'feed_url': iri_to_uri(feed_url),
            'feed_copyright': to_unicode(feed_copyright),
            'id': feed_guid or link,
            'ttl': ttl,
        }
        self.feed.update(kwargs)

        to_unicode = lambda s: force_text(s, strings_only=True)
        if categories:

        to_unicode = lambda s: force_text(s, strings_only=True)
        if categories: