Python BeautifulSoup硒刮刀 [英] Python BeautifulSoup selenium scraper

问题描述

我正在使用以下python脚本从Amazon

I'm using the following python script for scraping info from Amazon pages.

At some point, it stopped returning page results. The script is starting, browsing through the keywords/pages but I only get the headers as output:

Keyword Rank Title ASIN Score Reviews Prime Date

I suspect that the problem is in the following line as this tag doesn't exist anymore and the results var doesn't get any value:

results = soup.findAll('div', attrs={'class': 's-item-container'})

This is the full code:

from bs4 import BeautifulSoup
import time
from selenium import webdriver
import re
import datetime
from collections import deque
import logging
import csv


class AmazonScaper(object):

    def __init__(self,keywords, output_file='example.csv',sleep=2):

        self.browser = webdriver.Chrome(executable_path='/Users/willcecil/Dropbox/Python/chromedriver')  #Add path to your Chromedriver
        self.keyword_queue = deque(keywords)  #Add the start URL to our list of URLs to crawl
        self.output_file = output_file
        self.sleep = sleep
        self.results = []


    def get_page(self, keyword):
        try:
            self.browser.get('https://www.amazon.co.uk/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords={a}'.format(a=keyword))
            return self.browser.page_source
        except Exception as e:
            logging.exception(e)
            return

    def get_soup(self, html):
        if html is not None:
            soup = BeautifulSoup(html, 'lxml')
            return soup
        else:
            return

    def get_data(self,soup,keyword):

        try:
            results = soup.findAll('div', attrs={'class': 's-item-container'})
            for a, b in enumerate(results):
                soup = b
                header = soup.find('h2')
                result = a + 1
                title = header.text
                try:
                    link = soup.find('a', attrs={'class': 'a-link-normal a-text-normal'})
                    url = link['href']
                    url = re.sub(r'/ref=.*', '', str(url))
                except:
                    url = "None"

                # Extract the ASIN from the URL - ASIN is the breaking point to filter out if the position is sponsored

                ASIN = re.sub(r'.*amazon.co.uk.*/dp/', '', str(url))

                # Extract Score Data using ASIN number to find the span class

                score = soup.find('span', attrs={'name': ASIN})
                try:
                    score = score.text
                    score = score.strip('\n')
                    score = re.sub(r' .*', '', str(score))
                except:
                    score = "None"

                # Extract Number of Reviews in the same way
                reviews = soup.find('a', href=re.compile(r'.*#customerReviews'))
                try:
                    reviews = reviews.text
                except:
                    reviews = "None"

                # And again for Prime

                PRIME = soup.find('i', attrs={'aria-label': 'Prime'})
                try:
                    PRIME = PRIME.text
                except:
                    PRIME = "None"

                data = {keyword:[keyword,str(result),title,ASIN,score,reviews,PRIME,datetime.datetime.today().strftime("%B %d, %Y")]}
                self.results.append(data)

        except Exception as e:
            print(e)

        return 1

    def csv_output(self):
        keys = ['Keyword','Rank','Title','ASIN','Score','Reviews','Prime','Date']
        print(self.results)
        with open(self.output_file, 'a', encoding='utf-8') as outputfile:
            dict_writer = csv.DictWriter(outputfile, keys)
            dict_writer.writeheader()
            for item in self.results:
                for key,value in item.items():
                    print(".".join(value))
                    outputfile.write(",".join('"' + item + '"' for item in value)+"\n") # Add "" quote character so the CSV accepts commas

    def run_crawler(self):
        while len(self.keyword_queue): #If we have keywords to check
            keyword = self.keyword_queue.popleft() #We grab a keyword from the left of the list
            html = self.get_page(keyword)
            soup = self.get_soup(html)
            time.sleep(self.sleep) # Wait for the specified time
            if soup is not None:  #If we have soup - parse and save data
                self.get_data(soup,keyword)
        self.browser.quit()
        self.csv_output() # Save the object data to csv


    if __name__ == "__main__":
        keywords = [str.replace(line.rstrip('\n'),' ','+') for line in 
    open('keywords.txt')] # Use our file of keywords & replaces spaces with +
    ranker = AmazonScaper(keywords) # Create the object
    ranker.run_crawler() # Run the rank checker

The output should look like this (I have trimmed the Titles for clarity).

Keyword Rank Title ASIN Score Reviews Prime Date

Blue+Skateboard 3 Osprey Complete Beginn B00IL1JMF4 3.7 40 Prime February 21, 2019 Blue+Skateboard 4 ENKEEO Complete Mini C B078J9Y1DG 4.5 42 Prime February 21, 2019 Blue+Skateboard 5 skatro - Mini Cruiser B00K93PIXM 4.8 223 Prime February 21, 2019 Blue+Skateboard 7 Vinsani Retro Cruiser B00CSV72AK 4.4 8 Prime February 21, 2019 Blue+Skateboard 8 Ridge Retro Cruiser Bo B00CA33ISQ 4.1 207 Prime February 21, 2019 Blue+Skateboard 9 Xootz Kids Complete Be B01B2YNSJM 3.6 32 Prime February 21, 2019 Blue+Skateboard 10 Enuff Pyro II Skateboa B00MGRGX2Y 4.3 68 Prime February 21, 2019

解决方案

The following shows some changes you could make. I have changed to using css selectors at some points.

The main result set to loop over are retrieved by soup.select('.s-result-list [data-asin]'). This specifies elements with class name .s-result-list having children with attribute data-asin. This matches the 60 (current) items on page.

I swapped the PRIME selection to using an attribute = value selector

Headers are now h5 i.e. header = soup.select_one('h5').

---

soup.select_one('[aria-label="Amazon Prime"]

Example code:

import datetime
from bs4 import BeautifulSoup
import time
from selenium import webdriver
import re

keyword = 'blue+skateboard'
driver = webdriver.Chrome()

url = 'https://www.amazon.co.uk/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords={}'

driver.get(url.format(keyword))
soup = BeautifulSoup(driver.page_source, 'lxml')
results = soup.select('.s-result-list [data-asin]')

for a, b in enumerate(results):
    soup = b
    header = soup.select_one('h5')
    result = a + 1
    title = header.text.strip()

    try:
        link = soup.select_one('h5 > a')
        url = link['href']
        url = re.sub(r'/ref=.*', '', str(url))
    except:
        url = "None"

    if url !='/gp/slredirect/picassoRedirect.html':
        ASIN = re.sub(r'.*/dp/', '', str(url))
        #print(ASIN)

        try:
            score = soup.select_one('.a-icon-alt')
            score = score.text
            score = score.strip('\n')
            score = re.sub(r' .*', '', str(score))
        except:
            score = "None"

        try:
            reviews = soup.select_one("href*='#customerReviews']")
            reviews = reviews.text.strip()
        except:
            reviews = "None"

        try:
            PRIME = soup.select_one('[aria-label="Amazon Prime"]')
            PRIME = PRIME['aria-label']
        except:
            PRIME = "None"
        data = {keyword:[keyword,str(result),title,ASIN,score,reviews,PRIME,datetime.datetime.today().strftime("%B %d, %Y")]}
        print(data)

---

Example output:

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