Python Selenium无法通过链接。 Pastebin爬行

Question

您好，我正在尝试为搜索ssh提取10页以上的所有链接。

加载JavaScript之后，我可以从第一页中提取前10个链接，然后，我可以在第一页中单击一次，然后提取下10个链接，但是当尝试转到第三页时，我得到了一个错误。

这是我的代码：

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
import requests
import re

links = []
driver = webdriver.Firefox()
driver.get("http://pastebin.com/search?q=ssh")

# wait for the search results to be loaded
wait = WebDriverWait(driver, 10)
wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, ".gsc-result-info")))
for link in driver.find_elements_by_xpath("//div[@class='gs-title']/a[@class='gs-title']"):
        if link.get_attribute("href") != None:
            print link.get_attribute("href")
# get all search results links
for page in driver.find_elements_by_xpath("//div[@class='gsc-cursor-page']"):
    driver.implicitly_wait(10) # seconds
    page.click()

    for link in driver.find_elements_by_xpath("//div[@class='gs-title']/a[@class='gs-title']"):
        if link.get_attribute("href") != None:
            print link.get_attribute("href")

这就是我所能获得的，以及我所犯的错误：

python pastebinselenium.py 
http://pastebin.com/u/ssh
http://pastebin.com/gsQWBEZP
http://pastebin.com/gfA12TWk
http://pastebin.com/udWMWdPR
http://pastebin.com/J55238CB
http://pastebin.com/DN2aHvRr
http://pastebin.com/f0rh66kU
http://pastebin.com/3zvY3DSm
http://pastebin.com/fqHVJGEm
http://pastebin.com/3aB7h0fm
http://pastebin.com/3uBAxXu3
http://pastebin.com/cxjRqeSh
http://pastebin.com/5nJPNr3Q
http://pastebin.com/qV0rPNfP
http://pastebin.com/zubt2Yc7
http://pastebin.com/jFrjWYpE
http://pastebin.com/DU7yqjQ1
http://pastebin.com/AFtWHmtE
http://pastebin.com/UVP5behK
http://pastebin.com/hP7XTyv1
Traceback (most recent call last):
  File "pastebinselenium.py", line 21, in <module>
    page.click()
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py", line 74, in click
    self._execute(Command.CLICK_ELEMENT)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py", line 457, in _execute
    return self._parent.execute(command, params)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 233, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: Element not found in the cache - perhaps the page has changed since it was looked up
Stacktrace:
    at fxdriver.cache.getElementAt (resource://fxdriver/modules/web-element-cache.js:9454)
    at Utils.getElementAt (file:///tmp/tmpzhZSEC/extensions/fxdriver@googlecode.com/components/command-processor.js:9039)
    at fxdriver.preconditions.visible (file:///tmp/tmpzhZSEC/extensions/fxdriver@googlecode.com/components/command-processor.js:10090)
    at DelayedCommand.prototype.checkPreconditions_ (file:///tmp/tmpzhZSEC/extensions/fxdriver@googlecode.com/components/command-processor.js:12644)
    at DelayedCommand.prototype.executeInternal_/h (file:///tmp/tmpzhZSEC/extensions/fxdriver@googlecode.com/components/command-processor.js:12661)
    at fxdriver.Timer.prototype.setTimeout/<.notify (file:///tmp/tmpzhZSEC/extensions/fxdriver@googlecode.com/components/command-processor.js:625)

我想从10个页面中提取10个链接（共100个），我只能提取20 =（

我也尝试过这个：

wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, ".gsc-cursor-box")))

click之前，但没有成功。

Answer 1

这个想法是在循环中单击分页链接，等待下一个页码在途中变为主动收集链接。 执行：

from pprint import pprint

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


driver = webdriver.Firefox()
driver.get("http://pastebin.com/search?q=ssh")

# wait for the search results to be loaded
wait = WebDriverWait(driver, 10)
wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, ".gsc-result-info")))

links = [link.get_attribute("href") for link in driver.find_elements_by_css_selector(".gsc-results .gs-result > .gsc-thumbnail-inside > .gs-title > a.gs-title")]
for page_number in range(2, 11):
    driver.find_element_by_xpath("//div[@class='gsc-cursor-page' and . = '%d']" % page_number).click()

    wait.until(EC.visibility_of_element_located((By.XPATH, "//div[contains(@class, 'gsc-cursor-current-page') and . = '%d']" % page_number)))

    links.extend([link.get_attribute("href") for link in driver.find_elements_by_css_selector(".gsc-results .gs-result > .gsc-thumbnail-inside > .gs-title > a.gs-title")])

print(len(links))
pprint(links)

打印：

100
['http://pastebin.com/u/ssh',
 'http://pastebin.com/gsQWBEZP',
  ...
 'http://pastebin.com/vtBgrndi',
 'http://pastebin.com/WgXrebLq',
 'http://pastebin.com/Nxui56Gh',
 'http://pastebin.com/Qef0LZPR',
 'http://pastebin.com/yNUh1fRe',
 'http://pastebin.com/2j0d8FzL',
 'http://pastebin.com/g92A2jAq']