Gearbest.com price tracking script

#!/usr/bin/python
import web, json, urllib, urllib2
from bs4 import BeautifulSoup
import os
import os.path
from termcolor import colored
from random import randint
from time import sleep

dir = "/home/pi/scripts/pythontest/db-files/" #folder where the DB files will be saved

# configure smtp server for sending mail
web.config.smtp_server = 'smtp.gmail.com'
web.config.smtp_port = 587
web.config.smtp_username = 'username@gmail.com'
web.config.smtp_password = 'password'
web.config.smtp_starttls = True

headers = { 'User-Agent' : 'Mozilla/5.0' } # headers for the url download request

url_list = []
url_list.append("http://www.gearbest.com/batteries-chargers/pp_140785.html")  #usb led light
url_list.append("http://www.gearbest.com/electronics-gadgets/pp_280338.html") # enhanced xiaomi led light
url_list.append("http://www.gearbest.com/other-classic-toys/pp_271768.html") # Mitko magnetic cubs
url_list.append("http://www.gearbest.com/tv-box-mini-pc/pp_284266.html") # Intel WiDi Display Dongle
url_list.append("http://www.gearbest.com/mobile-power-bank/pp_187685.html") # Mi 10k Ah Battery
url_list.append("http://www.gearbest.com/tv-box-mini-pc/pp_238050.html") # pipo x8 64 gb
url_list.append("http://www.gearbest.com/speakers/pp_228241.html") # MPow Bluetooth Speaker

def price_check(check_url):
#build the request for the page that will be checked
    req = urllib2.Request(check_url, None, headers)
#reads the html
    html = urllib2.urlopen(req).read()

    soup = BeautifulSoup(html) #it'll make this an obj
    soup.get_text() #this will print all the text no html code

    rawprice = soup.findAll(attrs={"name":"og:price"}) #get the price
    price = rawprice[0]['content'].encode('utf-8')

    image = soup.findAll(attrs={"name":"og:image"}) #get the image
    image = image[0]['content'].encode('utf-8')
    image = "<img src='" + image + "'>"

    product_name = soup.findAll(attrs={"name":"og:description"}) #get product name
    product_name = product_name[0]['content'].encode('utf-8')

    print colored(product_name, 'yellow')

    print "New price:", price,

# build the path and open the DB file where last product price is stored
    db_filename = dir + product_name.replace(" ", "") + ".txt"

    if os.path.isfile(db_filename):  # check if file exists
        fo = open(db_filename, "r+")
        oldprice = fo.readline() # if there is a file read the previous value
    else:
        fo = open(db_filename, "w+") # create the missing file
        oldprice = "$0" # set previous price to 0

    print " / Old price: ", oldprice,

    position = fo.seek(0, 0);

    fo.write(price+"\n")        # write the new value
    fo.close()                  # close the file

    price = price.replace("$", "")
    old_price = oldprice.replace("$", "")

    change = None

    if float(price) > float(old_price):
        message = 'New price: ${} <b>The price have raised with ${}</b>'.format(price, float(price) - float(old_price))
        print message + "\n"
        change = True
    elif float(price) < float(old_price): # check if there is a price drop
        message = "New price: ${} <b>The price have droped with ${}</b>".format(price, float(old_price) - float(price))
        print message  + "\n"
        change = True
    elif float(price) == float(old_price):
        message = "No change"
        print "No price change \n"

    message = "<h2>" + product_name + "</h2>" + message + "<br/><a href='" + check_url +"'>"+ image +"</a>"

    if (change and old_price != "0"):
        web.sendmail('sender@gmail.com', 'receiver@gmail.com',"Price Change " + product_name, message, headers={'Content-Type':'text/html;charset=utf-8'})
    return (old_price,price,change)

i = 0
while i < len(url_list):
    price_check(url_list[i])
    sleep(randint(10,30))
    i = i + 1