from lxml.etree import etree
class __price_scraper__:
    def __init__(self,url,page_source):
        self.url = url
        self.page_source = page_source
        self.etree = etree.fromstring(self.page_source)

    def scrape(self):
        scrape_for = ['price','name']
        if self.in_stock():
            for cat in scrape_for:
                self.__setattr__(cat,eval_xpath(cat))

    def eval_xpath(name):
        return self.etree.xpath(self.xpaths[name])

    def __get_stock__(self):
        return self.eval_xpath('in_stock')

def amazon_scraper(__price_scraper__):
    xpaths = {
    }
    def in_stock(self):
        stock_val = self.__get_stock__()
        return stock_val != 'poop'