AttributeError: 'NoneType' object in a parser - stops it

[apollo]

dear python-experts good day,



I'm currently working on a parser to make a small preview of a page from a URL given by the user in PHP.

I'd like to retrieve only the title of the page and a little chunk of information (a bit of text)

The project: for a list of meta-data of popular wordpress-plugins (cf. https://de.wordpress.org/plugins/browse/popular/ and gathering the first 50 URLs - that are 50 plugins which are of interest! The challenge is: i want to fetch meta-data of all the existing plugins. What i subsequently want to filter out after the fetch is - those plugins that have the newest timestamp - that are updated (most) recently. It is all aobut acutality...

https://wordpress.org/plugins/wp-job-manager
https://wordpress.org/plugins/ninja-forms
https://wordpress.org/plugins/participants-database ....and so on and so forth.

import requests
from bs4 import BeautifulSoup
from concurrent.futures.thread import ThreadPoolExecutor

url = "https://wordpress.org/plugins/browse/popular/{}"


def main(url, num):
    with requests.Session() as req:
        print(f"Collecting Page# {num}")
        r = req.get(url.format(num))
        soup = BeautifulSoup(r.content, 'html.parser')
        link = [item.get("href")
                for item in soup.findAll("a", rel="bookmark")]
        return set(link)


with ThreadPoolExecutor(max_workers=20) as executor:
    futures = [executor.submit(main, url, num)
               for num in [""]+[f"page/{x}/" for x in range(2, 50)]]

allin = []
for future in futures:
    allin.extend(future.result())


def parser(url):
    with requests.Session() as req:
        print(f"Extracting {url}")
        r = req.get(url)
        soup = BeautifulSoup(r.content, 'html.parser')
        target = [item.get_text(strip=True, separator=" ") for item in soup.find(
            "h3", class_="screen-reader-text").find_next("ul").findAll("li")[:8]]
        head = [soup.find("h1", class_="plugin-title").text]
        new = [x for x in target if x.startswith(
            ("V", "Las", "Ac", "W", "T", "P"))]
        return head + new


with ThreadPoolExecutor(max_workers=50) as executor1:
    futures1 = [executor1.submit(parser, url) for url in allin]

for future in futures1:
    print(future.result())
    

see the results:

Extracting https://wordpress.org/plugins/tuxedo-big-file-uploads/Extracting https://wordpress.org/plugins/cherry-sidebars/
Extracting https://wordpress.org/plugins/meks-smart-author-widget/
Extracting https://wordpress.org/plugins/wp-limit-login-attempts/

Extracting https://wordpress.org/plugins/automatic-translator-addon-for-loco-translate/
Extracting https://wordpress.org/plugins/event-organiser/
Traceback (most recent call last):

  File "/home/martin/unbenannt0.py", line 45, in <module>
    print(future.result())

  File "/home/martin/anaconda3/lib/python3.7/concurrent/futures/_base.py", line 428, in result
    return self.__get_result()

  File "/home/martin/anaconda3/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception

  File "/home/martin/anaconda3/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)

  File "/home/martin/unbenannt0.py", line 34, in parser
    "h3", class_="screen-reader-text").find_next("ul").findAll("li")[:8]]

AttributeError: 'NoneType' object has no attribute 'find_next'

    

- well i have a severe error - the

AttributeError: 'NoneType' object has no attribute 'find_next'
    

at the moment i do not know how to fix this - this i goes a bit over my head. 'Any help would appreciated.


btw.- besides this error i want to add a option that gives the results back in CSV-formate

many thanks in advance

yours apollo

[Yoriz]

It looks like soup.find("h3", class_="screen-reader-text") has not found anything.
You could either break this line up and only call find_next if there was a result or use a try/except that captures the AttributeError.

[Larz60+]

please show the complete and unaltered error traceback.
It contains valuable process call stack information.

you can surround the offending code with:

try:
    code that causes error
except AttributeError:
    print(f"Attribution error on {some data here}, {whatever else would be of value}, {...}")
    ... whatever action you wish to take here.

[apollo]

hello dear Larzlo60 and dear Yoriz

first of all many many thanks for the quick reply. well i have to admint that tiis little script goes ovcer my actual knowledge limit

i have no glue what goes wrong here


?S - perhaps i have to have a closer look at the conditions of the script



btw: see here the full output: https://pastebin.com/nBXUW1a1

and here see more .. i hope that helps a bit:

Extracting https://wordpress.org/plugins/automatic-translator-addon-for-loco-translate/
Extracting https://wordpress.org/plugins/wpforo/Extracting https://wordpress.org/plugins/accesspress-social-share/
Extracting https://wordpress.org/plugins/mailoptin/
Extracting https://wordpress.org/plugins/tuxedo-big-file-uploads/

Extracting https://wordpress.org/plugins/post-snippets/
Extracting https://wordpress.org/plugins/woocommerce-payfast-gateway/Extracting https://wordpress.org/plugins/woocommerce-grid-list-toggle/

Extracting https://wordpress.org/plugins/goodbye-captcha/
Extracting https://wordpress.org/plugins/gravity-forms-google-analytics-event-tracking/
Traceback (most recent call last):

  File "/home/martin/dev/wordpress_plugin.py", line 44, in <module>
    print(future.result())

  File "/home/martin/anaconda3/lib/python3.7/concurrent/futures/_base.py", line 428, in result
    return self.__get_result()

  File "/home/martin/anaconda3/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception

  File "/home/martin/anaconda3/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)

  File "/home/martin/dev/wordpress_plugin.py", line 33, in parser
    "h3", class_="screen-reader-text").find_next("ul").findAll("li")[:8]]

AttributeError: 'NoneType' object has no attribute 'find_next'

i look forward to hear from you again

yours apollo

[Daring_T]

If you want to know more about error handling here's the link for PY docs: https://docs.python.org/3.9/tutorial/errors.html and Corey Shafer has a video on error handling: https://www.youtube.com/watch?v=NIWwJbo-9_8