from models import Post

def get_post_url(post):
    post_year = str(post.publication_date.year)
    post_month = '%02d' % post.publication_date.month
    post_title = post.title
    url = u'/blog/' + post_year + '/' + post_month + '/' + post_title + '/'
    return url

def post_as_components(post_text):
    ''' This function returns the components of a blog post for use with other
    functions. Given a Markdown formatted post, it returns a three-tuple. The
    first element is the blog title (not markdowned), the second is the first
    paragraph (in Markdown format) and the third is the entire post body (in
    Markdown format).
    '''
    post_content = post_text.split('\n\n')
    title = post_content[0].strip('# ')
    first_para = post_content[1]
    body = u'\n\n'.join(post_content[1:])
    return (title, first_para, body)


from models import Post
from django.core.urlresolvers import reverse

def get_post_url(post):
    post_year = str(post.publication_date.year)
    post_month = '%02d' % post.publication_date.month
    post_title = post.title
    #url = u'/blog/' + post_year + '/' + post_month + '/' + post_title + '/'
    url = reverse('blog_post', kwargs={'post_year': post_year,
                                       'post_month': post_month,
                                       'post_title': post_title})
    return url

def post_as_components(post_text):
    ''' This function returns the components of a blog post for use with other
    functions. Given a Markdown formatted post, it returns a three-tuple. The
    first element is the blog title (not markdowned), the second is the first
    paragraph (in Markdown format) and the third is the entire post body (in
    Markdown format).
    '''
    post_content = post_text.split('\n\n')
    title = post_content[0].strip('# ')
    first_para = post_content[1]
    body = u'\n\n'.join(post_content[1:])
    return (title, first_para, body)


Use named urls for get_post_url().
Use named urls for get_post_url().

The helper should not assume knowledge of the post url structure.
