您需要循环该列表。您可以使用 Session 来提高效率。以下是针对 bs 4.7.1 支持的:contains
用于查找引用计数的伪类。看起来你可以删除h3
从 css 选择器中输入选择器,然后在之前使用 classa
i.e. .gs_rt a
。如果您没有 4.7.1。您可以使用[title=Cite] + a
选择引用计数。
import requests
from bs4 import BeautifulSoup as bs
queries = ['Role for migratory wild birds in the global spread of avian influenza H5N8',
'Uncoupling conformational states from activity in an allosteric enzyme',
'Technological Analysis of the World’s Earliest Shamanic Costume: A Multi-Scalar, Experimental Study of a Red Deer Headdress from the Early Holocene Site of Star Carr, North Yorkshire, UK',
'Oxidative potential of PM 2.5 during Atlanta rush hour: Measurements of in-vehicle dithiothreitol (DTT) activity',
'Primary Prevention of CVD','Growth and Deposition of Au Nanoclusters on Polymer-wrapped Graphene and Their Oxygen Reduction Activity',
'Relations of Preschoolers Visual-Motor and Object Manipulation Skills With Executive Function and Social Behavior',
'We Know Who Likes Us, but Not Who Competes Against Us']
with requests.Session() as s:
for query in queries:
url = 'https://scholar.google.com/scholar?q=' + query + '&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search'
r = s.get(url)
soup = bs(r.content, 'lxml') # or 'html.parser'
title = soup.select_one('h3.gs_rt a').text if soup.select_one('h3.gs_rt a') is not None else 'No title'
link = soup.select_one('h3.gs_rt a')['href'] if title != 'No title' else 'No link'
citations = soup.select_one('a:contains("Cited by")').text if soup.select_one('a:contains("Cited by")') is not None else 'No citation count'
print(title, link, citations)
with requests.Session() as s:
for query in queries:
url = 'https://scholar.google.com/scholar?q=' + query + '&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search'
r = s.get(url)
soup = bs(r.content, 'lxml') # or 'html.parser'
title = soup.select_one('.gs_rt a')
if title is None:
title = 'No title'
link = 'No link'
else:
link = title['href']
title = title.text
citations = soup.select_one('[title=Cite] + a')
if citations is None:
citations = 'No citation count'
else:
citations = citations.text
print(title, link, citations)
感谢@facelessuser 的评论,底层版本被重新编写。留下的顶级版本进行比较:
在单行 if 语句中不要调用 select_one 两次可能会更有效。当模式构建被缓存时,返回的标签不会被缓存。我个人会将变量设置为 select_one 返回的任何内容,然后,仅当变量为 None 时,将其更改为 No link 或 No title 等。它不是那么紧凑,但会更有效
[...]始终检查 if tag 是否为 None: 而不仅仅是 if tag:。对于选择器来说,这并不是什么大问题,因为它们只会返回标签,但如果你曾经做过类似 for x in tag.descendants 的事情:你会得到文本节点(字符串)和标签,并且空字符串将评估为 false,即使它是一个有效的节点。在这种情况下,检查 None 是最安全的