我正在使用selenium和beautifulsoup来抓取网站。需要知道网站总共有多少页，或者其他浏览页面的方式。

Question

我正在使用SeleniumWebDriver和BeautifulSoup来抓取一个具有可变多个页面数的网站。我是通过xpath粗略地做的。一个页面显示五个页面，在计数为五之后，我按下next按钮并重置xpath计数以获得下一个5页。为此，我需要通过代码或更好的方式导航到不同的网页在网站总页面。你知道吗

我认为这个页面使用了java脚本进行导航。代码如下：

import requests
from bs4 import BeautifulSoup
from selenium import webdriver
driver = webdriver.Chrome()
driver.maximize_window()
spg_index=' '
url = "https://www.bseindia.com/corporates/ann.html"
driver.get(url)
soup = BeautifulSoup(driver.page_source, 'html.parser')
html=soup.prettify()
with open('bseann.txt', 'w', encoding='utf-8') as f:
    f.write(html)
time.sleep(1)
i=1  #index for page numbers navigated. ket at maximum 31 at present
k=1  #goes upto 5, the maximum navigating pages shown at one time
while i <31:
    next_pg=9   #xpath number to pinpoint to "next" page 
    snext_pg=str(next_pg)
    snext_pg=snext_pg.strip()
    if i> 5:
        next_pg=10  #when we go to next set of pages thr is a addl option
        if(i==6) or(i==11)or(i==16):#resetting xpath indx for set of pg's
        k=2
        path='/html/body/div[1]/div[5]/div[2]/div[1]/div[1]/ul/li['
        path=path+snext_pg+']/a'
        next_page_btn_list=driver.find_elements_by_xpath(path)
        next_page_btn=next_page_btn_list[0]
        next_page_btn.click()  #click next page
        time.sleep(1)
    pg_index= k+2
    spg_index=str(pg_index)
    spg_index=spg_index.strip()     
    path= '/html/body/div[1]/div[5]/div[2]/div[1]/div[1]/ul/li['
    path=path+spg_index+']/a'
    next_page_btn_list=driver.find_elements_by_xpath(path)
    next_page_btn=next_page_btn_list[0]
    next_page_btn.click()  #click specific pg no. 
    time.sleep(1)
    soup = BeautifulSoup(driver.page_source, 'html.parser')
    html=soup.prettify()
    i=i+1
    k=k+1
    with open('bseann.txt', 'a', encoding='utf-8') as f:
        f.write(html)

Answer 1

这里不需要使用Selenium，因为您可以从API访问信息。共发布了247条公告：

import requests
from pandas.io.json import json_normalize

url = 'https://api.bseindia.com/BseIndiaAPI/api/AnnGetData/w'

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36'}

payload = {
'strCat': '-1',
'strPrevDate': '20190423',
'strScrip': '',
'strSearch': 'P',
'strToDate': '20190423',
'strType': 'C'}

jsonData = requests.get(url, headers=headers, params=payload).json()

df = json_normalize(jsonData['Table'])
df['ATTACHMENTNAME'] = '=HYPERLINK("https://www.bseindia.com/xml-data/corpfiling/AttachLive/' + df['ATTACHMENTNAME'] + '")'


df.to_csv('C:/filename.csv', index=False)

输出：

...

GYSCOAL ALLOYS LTD. - 533275 - Announcement under Regulation 30 (LODR)-Code of Conduct under SEBI (PIT) Regulations, 2015
https://www.bseindia.com/xml-data/corpfiling/AttachLive/82f18673-de98-4a88-bbea-7d8499f25009.pdf

INDIAN SUCROSE LTD. - 500319 - Certificate Under Regulation 40(9) Of Listing Regulation For The Half Year Ended 31.03.2019
https://www.bseindia.com/xml-data/corpfiling/AttachLive/2539d209-50f6-4e56-a123-8562067d896e.pdf

Dhanvarsha Finvest Ltd - 540268 - Reply To Clarification Sought From The Company
https://www.bseindia.com/xml-data/corpfiling/AttachLive/f8d80466-af58-4336-b251-a9232db597cf.pdf

Prabhat Telecoms (India) Ltd - 540027 - Signing Of Framework Supply Agreement With METRO Cash & Carry India Private Limited
https://www.bseindia.com/xml-data/corpfiling/AttachLive/acfb1f72-efd3-4515-a583-2616d2942e78.pdf

...

Answer 2

关于您的用例的更多信息将有助于回答您的问题。但是，要提取website中总页数的信息，您可以访问该站点，单击文本为下一步的项目，然后提取所需的数据，您可以使用以下解决方案：

• 代码块：

  from selenium import webdriver
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.support import expected_conditions as EC
  
  options = webdriver.ChromeOptions() 
  options.add_argument("start-maximized")
  options.add_argument(" disable-extensions")
  # options.add_argument('disable-infobars')
  driver = webdriver.Chrome(chrome_options=options, executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')
  driver.get("https://www.bseindia.com/corporates/ann.html")
  WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//a[text()='Disclaimer']//following::div[1]//li[@class='pagination-last ng-scope']/a[@class='ng-binding' and text()='Last']"))).click()
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//a[text()='Disclaimer']//following::div[1]//li[@class='pagination-page ng-scope active']/a[@class='ng-binding']"))).get_attribute("innerHTML"))
  

• 控制台输出：

  17