scrape Amazon multiple price page for lowest price

amazon_scrape.py

#Configuration variables

BASE_URL = "http://www.amazon.com/gp/offer-listing/"

XPATH_SELECTOR = '//body//*[@class="a-size-large a-color-price olpOfferPrice a-text-bold"]'

USER_AGENT = {'User-agent': 'Mozilla/5.0'}

ITEM = '1429218274'

import requests
from lxml import html

page = requests.get(BASE_URL + ITEM, headers=USER_AGENT)

tree = html.fromstring(page.text)

t = tree.xpath(XPATH_SELECTOR)[0].text

j = t[t.find('$') : ]

digits = '0123456789.'
price = float(''.join(c for c in t if c in digits))

print price