web crawler problems - Printable Version

web crawler problems - Printable Version

+- Python Forum (https://python-forum.io)
+-- Forum: Python Coding (https://python-forum.io/forum-7.html)
+--- Forum: Web Scraping & Web Development (https://python-forum.io/forum-13.html)
+--- Thread: web crawler problems (/thread-19147.html)

web crawler problems - kid_with_polio - Jun-14-2019

Hi, I followed along with a web crawler tutorial on Youtube but I can't seem to get the code to work even though I used an updated website. I have all the used packages installed and at first I got a traceback error with BeautifulSoup() that said it needed an additional parameter of features = "html.parser"

[Image: 8wdbI]

I inserted this and now the traceback I receive is nothing at all. Does anyone have a solution to this issue or know why it is caused?

[Image: 8wirL]

RE: web crawler problems - micseydel - Jun-14-2019

Please post code in code tags, we pretty much never want to see images of text.

RE: web crawler problems - kid_with_polio - Jun-14-2019

import requests
from bs4 import BeautifulSoup

def trade_spider(max_pages):
    page = 1
    while page <= max_pages:
        url = 'http://books.toscrape.com/catalogue/page-' + str(page) + '.html'
        source_code = requests.get(url)
        plain_text = source_code.text
        soup = BeautifulSoup(plain_text, features="html.parser")
        for link in soup.findAll('a', {'class': 'title'}):
            href = link.get('href')
            print(href)
        page += 1

trade_spider(1)

here's the traceback:

"C:\Users\Jake\PycharmProjects\practice baby\venv\Scripts\python.exe" "C:/Users/Jake/PycharmProjects/practice baby/web crawler 2.py"

Process finished with exit code 0

RE: web crawler problems - metulburr - Jun-15-2019

That is not an error, that just means than nothing is being printed out at all. You didnt find the href's

try this code:

import requests
from bs4 import BeautifulSoup
 
def trade_spider(max_pages):
    page = 1
    while page <= max_pages:
        url = 'http://books.toscrape.com/catalogue/page-{}.html'.format(page)
        source_code = requests.get(url)
        plain_text = source_code.text
        soup = BeautifulSoup(plain_text, "html.parser")
        books = soup.find_all('li', {'class':'col-xs-6 col-sm-4 col-md-3 col-lg-3'})
        for book in books:
            a = book.find('a')
            link = a['href']
            title = a.find('img')['alt']
            print(link)
            print(title)
        page += 1
 
trade_spider(1)