问题
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
回答1:
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:
来源：https://stackoverflow.com/questions/55609049/python-beautifulsoup-selenium-scraper