我想获取嵌套标记中的数字。我该怎么做?
我的代码输出了这个,但我想得到#40,而不是整行两行:
<span class="rankings-score">
<span>#40</span>
这是我的代码:
from bs4 import BeautifulSoup
import requests
import csv
site = "http://www.usnews.com/education/best-high-schools/national-rankings/page+2"
fields = ['national_rank','school','address','school_page','medal','ratio','size_desc','students','teachers']
r = requests.get(site)
html_source = r.text
soup = BeautifulSoup(html_source)
table = soup.find('table')
rows_list = []
for row in table.find_all('tr'):
d = dict()
d['national_rank'] = row.find("span", 'rankings-score')
print d['national_rank']
我收到此错误:
AttributeError: 'NoneType' object has no attribute 'span'
当我尝试这个时:
d['national_rank'] = row.find("span", 'rankings-score').span.text
答案 0 :(得分:5)
访问嵌套范围的文本:
score_span = row.find("span", 'rankings-score')
if score_span is not None:
print score_span.span.text
您需要确保row.find("span", 'rankings-score')
确实找到了某些内容;上面我测试 确实找到了<span>
。
如果找不到匹配的对象,.find()
方法会返回None
,因此通常情况下,每当遇到AttributeError: 'NoneType' object has no attribute ...
异常时,涉及您尝试使用{{1}加载的对象然后,您需要在尝试进一步访问信息之前测试Element.find()
。
这适用于None
,object.find
,object.find_all
代码属性访问权限,object[...]
,object.<tagname>
等。