How to pass python variable to html variable?

I need to read a url link from text file in python as a variable, and use it in html. The text file "file.txt" contains only one line "http://188.xxx.xxx.xx:8878", this line should be saved in the variable "link", then I should use the contain of this variable in the html, so that the link should be opened when I click on the button image "go_online.png". I tried to change my code as following but it doesn't work! any help please?

#!/usr/bin/python
import cherrypy
import os.path
from auth import AuthController, require, member_of, name_is
class Server(object):
    _cp_config = {
        'tools.sessions.on': True,
        'tools.auth.on': True
    }   
    auth = AuthController()      
    @cherrypy.expose
    @require()
    def index(self):
        f = open ("file.txt","r")
        link = f.read()
        print link
        f.close()
        html = """
        <html>
        <script language="javascript" type="text/javascript">
           var var_link = '{{ link }}';
        </script> 
          <body>
            <p>{htmlText} 
            <p>          
            <a href={{ var_link }} ><img src="images/go_online.png"></a>
          </body>
        </html> 
           """

        myText = ''           
        myText = "Hellow World"          
        return html.format(htmlText=myText)
    index.exposed = True

#configuration
conf = {
    'global' : { 
        'server.socket_host': '0.0.0.0', #0.0.0.0 or specific IP
        'server.socket_port': 8085 #server port
    },

    '/images': { #images served as static files
        'tools.staticdir.on': True,
        'tools.staticdir.dir': os.path.abspath('/home/ubuntu/webserver/images')
    }
    }
cherrypy.quickstart(Server(), config=conf)

first off, not sure that the javascript part makes any sense, just leave it out. Also, your opening a p tag but not closing it. Not sure what your templating engine is, but you could just pass in the variables in pure python. Also, make sure to put quotes around your link. So your code should be something like:

class Server(object):
    _cp_config = {
        'tools.sessions.on': True,
        'tools.auth.on': True
    }   
    auth = AuthController()      
    @cherrypy.expose
    @require()
    def index(self):
        f = open ("file.txt","r")
        link = f.read()
        f.close()
        myText = "Hello World" 
        html = """
        <html>
            <body>
                <p>%s</p>          
                <a href="%s" ><img src="images/go_online.png"></a>
            </body>
        </html>
        """ %(myText, link)        
        return html
    index.exposed = True

(btw, the %s things are string placeholders, that will be poplulated the variables in %(firstString, secondString) at the end of the the multi line string.