python package markdown2 how to use

1def save(self, commit=True):
2        author = self.cleaned_data['author']
3        title = self.cleaned_data['title']
4        content = self.cleaned_data['content']
5        markdown = Markdown()
6        html = markdown.convert(content)
7        post = Post(author=author, title=title, content=content, html=html)
8        post.save()
9
10        tags_text = self.cleaned_data['tags']
11        tag_names = split_tags(tags_text)
12        for tag_name in tag_names:
13            tag_name.strip()
14            if 0 < len(tag_name) < 16:
15                tag = self.create_and_get(tag_name)
16                post.tags.add(tag)
17
18        return self.instance