如果我在BS4中有代码:
shopping_bag_body = html_tree.find('table', attrs={'id': 'shoppingBag'}).find('tbody')
all_products = shopping_bag_body.find_all('tr')
product_price = product.find('td', attrs={'class': 'column-5'}).find('span', attrs={'class': 'price'})
在这种情况下如何使用LXML xpath?