python爬虫 为何for循环语句无法输出

Question

请问下面这段代码，输出时只显示第一排中文标题，然后就停止了，本人小白，，刚学，很多不懂，大虾求解 import urllib2 import re from bs4 import BeautifulSoup def crawl(url): page = urllib2.urlopen(url) contents = page.read() soup = BeautifulSoup(contents) print(u' 豆瓣电影TOP250:\n 序号 \t影片名\t 评分 \t评价人数 \t 链接 ') for tag in soup.find_all('tr', class_='item'): #print tag m_order = int(tag.find('td', class_='m_order').get_text()) m_name = tag.a.get_text() m_year = tag.span.get_text() m_rating_score = float(tag.em.get_text()) m_rating_num = int(tag.find(headers="m_rating_num").get_text()) m_url=str(tag.find('a')).split('"')[1] #print m_url print("%s %s %s %s %s %s " % (m_order, m_name, m_year, m_rating_score, m_rating_num,m_url)) if name == 'main': crawl('http://movie.douban.com/top250?format=text')