python爬虫 - python爬取豆瓣电影，无法抓取到内容
代码：
# /usr/bin/python
#coding:utf-8
__author__ = 'eyu Fanne'
import requests,re
from bs4 import BeautifulSoup
move_url = 'https://movie.douban.com/'
def Robot():
res_url = requests.get(move_url)
print res_url.status_code
soup = BeautifulSoup(res_url.text,'lxml')
print soup.title
soup_a = soup.find_all("a",class_="item")
for i in soup_a:
print i
print soup_a
if __name__=='__main__':
Robot()
结果：
200
<title>
豆瓣电影</title>
[]
抓取
<a class='item' ....>这个标签内的值，但获取到的空，这是为何。
