Small web page with Python - python-2.7

Question

I have created a small wiki page with Bottle: Python web framework. Every thing is working fine right now. You create a article by going to "Create a new article" and giving it a Title and write down some Text. Then all of the created article shows on the index page in a list, and you can click on them to open and read.
But the thing is when i click on the article with the purpose to edit the article by giving it a new title and add some new words to the text. It doesn't change the name on the orginal textfile, instead i get a new textfile with the new title and the orginal textfile still remains.
This is the code:
from bottle import route, run, template, request, static_file
from os import listdir
import sys
host='localhost'
#route('/static/<filname>')
def serce_static(filname):
return static_file(filname, root="static")
#route("/")
def list_articles():
'''
This is the home page, which shows a list of links to all articles
in the wiki.
'''
files = listdir("wiki")
articles = []
for i in files:
lista = i.split('.')
word = lista[0]
lista1 = word.split('/')
articles.append(lista1[0])
return template("index", articles=articles)
#route('/wiki/<article>',)
def show_article(article):
'''
Displays the user´s text for the user
'''
wikifile = open('wiki/' + article + '.txt', 'r')
text = wikifile.read()
wikifile.close()
return template('page', title = article, text = text)
#route('/edit/')
def edit_form():
'''
Shows a form which allows the user to input a title and content
for an article. This form should be sent via POST to /update/.
'''
return template('edit')
#route('/update/', method='POST')
def update_article():
'''
Receives page title and contents from a form, and creates/updates a
text file for that page.
'''
title = request.forms.title
text = request.forms.text
tx = open('wiki/' + title + '.txt', 'w')
tx.write(text)
tx.close()
return template('thanks', title=title, text=text)
run(host='localhost', port=8080, debug=True, reloader=True)

Answer 1

The article object is too simple to list, edit or update.
The article should have an ID as its file name.
The article file should have two fields: title and text.
For example: 10022.txt
title:
bottle
text:
Bottle is a fast, simple and lightweight WSGI micro web-framework for Python.
You should retrieve the article by ID.
You can open the file by ID and change its title and text.