format_example.py

post_list = blobs_from_db

interested_in_formatting_posts = some_list1
interested_in_formatting_the_page = some_list2
# when modules are loaded they add methods to whatever "interest" lists they want

def format_posts():
    for element in post_list: # list of text blobs from database
        for formatter in interested_in_posts:
            element = formatter(element)

def format_page():
    formatted_posts = "\n".join(post_list)
    page = standard_header + formatted_posts + standard_footer
    for formatter in interested_in_formatting_page:
        page = formatter(page)

def display():
    #cherrypy code to display page we have constructed