Pri*_*Nom 11 python selenium urllib3 python-requests geckodriver
我不确定为什么,但我的脚本一旦到达第9页就会停止爬行.没有错误,例外或警告,所以我有点不知所措.
有人可以帮帮我吗？
def initiate_crawl():
def refresh_page(url):
ff = create_webdriver_instance()
ff.get(url)
ff.find_element(By.XPATH, '//*[@id="FilterItemView_sortOrder_dropdown"]/div/span[2]/span/span/span/span').click()
ff.find_element(By.XPATH, '//a[contains(text(), "Discount - High to Low")]').click()
items = WebDriverWait(ff, 15).until(
EC.visibility_of_all_elements_located((By.XPATH, '//div[contains(@id, "100_dealView_")]'))
)
print(len(items))
for count, item in enumerate(items):
slashed_price = item.find_elements(By.XPATH, './/span[contains(@class, "a-text-strike")]')
active_deals = item.find_elements(By.XPATH, './/*[contains(text(), "Add to Cart")]')
if len(slashed_price) > 0 and len(active_deals) > 0:
product_title = item.find_element(By.ID, 'dealTitle').text
if product_title not in already_scraped_product_titles:
already_scraped_product_titles.append(product_title)
url = ff.current_url
ff.quit()
refresh_page(url)
break
if count+1 is len(items):
try:
next_button = WebDriverWait(ff, 15).until(
EC.text_to_be_present_in_element((By.PARTIAL_LINK_TEXT, 'Next?'), 'Next?')
)
ff.find_element(By.PARTIAL_LINK_TEXT, 'Next?').click()
url = ff.current_url
ff.quit()
refresh_page(url)
except Exception as error:
print(error)
ff.quit()
refresh_page('https://www.amazon.ca/gp/goldbox/ref=gbps_ftr_s-3_4bc8_dct_10-?gb_f_c2xvdC0z=sortOrder:BY_SCORE,discountRanges:10-25%252C25-50%252C50-70%252C70-&pf_rd_p=f5836aee-0969-4c39-9720-4f0cacf64bc8&pf_rd_s=slot-3&pf_rd_t=701&pf_rd_i=gb_main&pf_rd_m=A3DWYIK6Y9EEQB&pf_rd_r=CQ7KBNXT36G95190QJB1&ie=UTF8')
initiate_crawl()
打印长度items也会引发一些奇怪的行为.它不是总是返回32,它对应于每页上的项目数,而是打印32第一页,64第二页,96第三页,依此类推.我通过使用//div[contains(@id, "100_dealView_")]/div[contains(@class, "dealContainer")]而不是//div[contains(@id, "100_dealView_")]作为items变量的XPath来修复它.我希望这就是它在第9页遇到问题的原因.我现在正在运行测试.更新:现在正在抓第10页及以后,所以问题已经解决.
HTTPConnectionPool(host='127.0.0.1', port=58992): Max retries exceeded with url: /session/e8beed9b-4faa-4e91-a659-56761cb604d7/element (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x0000022D31378A58>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))
...暗示该get()方法未能引发HTTPConnectionPool错误并显示消息Max retries exceeded。
几件事：
根据讨论max-retries-exceeded 异常令人困惑，回溯有些误导。为方便用户，请求包装了异常。原始异常是显示消息的一部分。
请求从不重试（它retries=0为 urllib3's 设置HTTPConnectionPool），因此如果没有MaxRetryError和HTTPConnectionPool关键字，错误会更加规范。所以理想的回溯应该是：
NewConnectionError(<class 'socket.error'>: [Errno 10061] No connection could be made because the target machine actively refused it)
您将在MaxRetryError: HTTPConnectionPool: Max retries exceeded (Caused by ProtocolError('Connection aborted.', error(111, 'Connection denied'))) 中找到详细说明
由于按照发行说明的硒3.14.1：
* Fix ability to set timeout for urllib3 (#6286)
该合并是：维修urllib3不能设置超时！
升级到Selenium 3.14.1 后，您将能够设置超时并查看规范的回溯并能够采取所需的操作。
几个相关的参考资料：
我从codepen.io - A PEN BY Anthony 中获取了您的完整脚本。我必须对您现有的代码进行一些调整，如下所示：
正如您所使用的：
ua_string = random.choice(ua_strings)
您必须强制导入random为：
import random
您已创建变量next_button但尚未使用它。我整理了以下四行：
next_button = WebDriverWait(ff, 15).until(
EC.text_to_be_present_in_element((By.PARTIAL_LINK_TEXT, 'Next?'), 'Next?')
)
ff.find_element(By.PARTIAL_LINK_TEXT, 'Next?').click()
作为：
WebDriverWait(ff, 15).until(EC.text_to_be_present_in_element((By.PARTIAL_LINK_TEXT, 'Next?'), 'Next?'))
ff.find_element(By.PARTIAL_LINK_TEXT, 'Next?').click()
您修改后的代码块将是：
# -*- coding: utf-8 -*-
from selenium import webdriver
from selenium.webdriver.firefox.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait
import time
import random
""" Set Global Variables
"""
ua_strings = ['Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36']
already_scraped_product_titles = []
""" Create Instances of WebDriver
"""
def create_webdriver_instance():
ua_string = random.choice(ua_strings)
profile = webdriver.FirefoxProfile()
profile.set_preference('general.useragent.override', ua_string)
options = Options()
options.add_argument('--headless')
return webdriver.Firefox(profile)
""" Construct List of UA Strings
"""
def fetch_ua_strings():
ff = create_webdriver_instance()
ff.get('https://techblog.willshouse.com/2012/01/03/most-common-user-agents/')
ua_strings_ff_eles = ff.find_elements_by_xpath('//td[@class="useragent"]')
for ua_string in ua_strings_ff_eles:
if 'mobile' not in ua_string.text and 'Trident' not in ua_string.text:
ua_strings.append(ua_string.text)
ff.quit()
""" Log in to Amazon to Use SiteStripe in order to Generate Affiliate Links
"""
def log_in(ff):
ff.find_element(By.XPATH, '//a[@id="nav-link-yourAccount"] | //a[@id="nav-link-accountList"]').click()
ff.find_element(By.ID, 'ap_email').send_keys('anthony_falez@hotmail.com')
ff.find_element(By.ID, 'continue').click()
ff.find_element(By.ID, 'ap_password').send_keys('lo0kyLoOkYig0t4h')
ff.find_element(By.NAME, 'rememberMe').click()
ff.find_element(By.ID, 'signInSubmit').click()
""" Build Lists of Product Page URLs
"""
def initiate_crawl():
def refresh_page(url):
ff = create_webdriver_instance()
ff.get(url)
ff.find_element(By.XPATH, '//*[@id="FilterItemView_sortOrder_dropdown"]/div/span[2]/span/span/span/span').click()
ff.find_element(By.XPATH, '//a[contains(text(), "Discount - High to Low")]').click()
items = WebDriverWait(ff, 15).until(
EC.visibility_of_all_elements_located((By.XPATH, '//div[contains(@id, "100_dealView_")]'))
)
for count, item in enumerate(items):
slashed_price = item.find_elements(By.XPATH, './/span[contains(@class, "a-text-strike")]')
active_deals = item.find_elements(By.XPATH, './/*[contains(text(), "Add to Cart")]')
# For Groups of Items on Sale
# active_deals = //*[contains(text(), "Add to Cart") or contains(text(), "View Deal")]
if len(slashed_price) > 0 and len(active_deals) > 0:
product_title = item.find_element(By.ID, 'dealTitle').text
if product_title not in already_scraped_product_titles:
already_scraped_product_titles.append(product_title)
url = ff.current_url
# Scrape Details of Each Deal
#extract(ff, item.find_element(By.ID, 'dealImage').get_attribute('href'))
print(product_title[:10])
ff.quit()
refresh_page(url)
break
if count+1 is len(items):
try:
print('')
print('new page')
WebDriverWait(ff, 15).until(EC.text_to_be_present_in_element((By.PARTIAL_LINK_TEXT, 'Next?'), 'Next?'))
ff.find_element(By.PARTIAL_LINK_TEXT, 'Next?').click()
time.sleep(10)
url = ff.current_url
print(url)
print('')
ff.quit()
refresh_page(url)
except Exception as error:
"""
ff.find_element(By.XPATH, '//*[@id="pagination-both-004143081429407891"]/ul/li[9]/a').click()
url = ff.current_url
ff.quit()
refresh_page(url)
"""
print('cannot find ff.find_element(By.PARTIAL_LINK_TEXT, "Next?")')
print('Because of... {}'.format(error))
ff.quit()
refresh_page('https://www.amazon.ca/gp/goldbox/ref=gbps_ftr_s-3_4bc8_dct_10-?gb_f_c2xvdC0z=sortOrder:BY_SCORE,discountRanges:10-25%252C25-50%252C50-70%252C70-&pf_rd_p=f5836aee-0969-4c39-9720-4f0cacf64bc8&pf_rd_s=slot-3&pf_rd_t=701&pf_rd_i=gb_main&pf_rd_m=A3DWYIK6Y9EEQB&pf_rd_r=CQ7KBNXT36G95190QJB1&ie=UTF8')
#def extract_info(ff, url):
fetch_ua_strings()
initiate_crawl()
控制台输出：使用Selenium v3.14.0和Firefox Quantum v62.0.3，我可以在控制台上提取以下输出：
J.Rosée Si
B.Catcher
Bluetooth4
FRAM G4164
Major Crim
20% off Oh
True Blood
Prime-Line
Marathon 3
True Blood
B.Catcher
4 Film Fav
True Blood
Texture Pa
Westinghou
True Blood
ThermoPro
...
...
...
注：我可以优化你的代码，并执行相同的网页抓取操作初始化火狐浏览器客户端只有一次，通过各种产品和他们的详细资料和遍历。但是为了保持你的逻辑和创新，我建议了让你通过所需的最小变化。
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