web crawler problems

[metulburr]

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)