CODEWITHSUNDEEP
python-2.7xpathweb-scrapingpython-requestslxml
humblenoob
humblenoob

Reputation: 101

Python lxml xpath no output

For educational purposes I am trying to scrape this page using lxml and requests in Python.

Specifically I just want to print the research areas of all the professors on the page. This is what I have done till now

import requests
from lxml import html

response=requests.get('http://cse.iitkgp.ac.in/index.php?secret=d2RkOUgybWlNZzJwQXdLc28wNzh6UT09')
parsed_body=html.fromstring(response.content)

for row in parsed_body.xpath('//div[@id="maincontent"]//tr[position() mod 2 = 1]'):
    for column in row.xpath('//td[@class="fcardcls"]/tr[2]/td/font/text()'):        
        print column.strip()

But it is not printing anything. I was struggling quite a bit with xpaths and was intially using the copy xpath feature in chrome. I followed what was done in the following SO questions/answers and cleaned up my code quite a bit and got rid of ' tbody ' in the xpaths. Still the code returns a blank.

1. Empty List Returned

2. Python-lxml-xpath problem

Upvotes: 1

Views: 534

Answers (1)

alecxe
alecxe

Reputation: 474161

First of all, the main content with the desired data inside is loaded from a different endpoint via an XHR request - simulate that in your code.

Here is the complete working code printing names and a list of research areas per name:

import requests
from lxml import html

response = requests.get('http://cse.iitkgp.ac.in/faculty4.php?_=1450503917634')
parsed_body = html.fromstring(response.content)

for row in parsed_body.xpath('.//td[@class="fcardcls"]'):
    name = row.findtext(".//a[@href]/b")
    name = ' '.join(name.split())  # getting rid of multiple spaces

    research_areas = row.xpath('.//*[. = "Research Areas: "]/following-sibling::text()')[0].split(", ")

    print(name, research_areas)

The idea here is use the fact that all "professor blocks" are located in td elements with class="fcardcls". For every block, get the name from the bold link text and research areas from the following string after Research Areas: bold text.

Upvotes: 2

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