Xpath适用于chrome dev工具，但不适用于python

Question

我想从此网页http://g1.globo.com/sao-paulo/noticia/camara-municipal-de-sp-aprova-concessao-do-pacaembu-a-iniciativa-privada.ghtml

中提取评论

我使用这个xpath：

.//div[contains(@itemprop, "creator")]/p[contains(@class, "glbComentarios-texto-comentario")]/text()

在chrome dev工具上完美运行：

result print of xpath on web page g1

这是我的代码：

import requests
from bs4 import BeautifulSoup
from lxml import html

page = requests.get('http://g1.globo.com/sao-paulo/noticia/camara-municipal-de-sp-aprova-concessao-do-pacaembu-a-iniciativa-privada.ghtml')

tree = html.fromstring(page.content)

comments = tree.xpath('.//div[contains(@itemprop, "creator")]/p[contains(@class, "glbComentarios-texto-comentario")]/text()')

但我只得到一个空列表。我也尝试过scrapy和BeautifulSoup，但我也没有成功。