Python硒代碼不起作用

Question

爲什麼根據xpath打開第一個元素後循環無法工作？ ，我得到下面的異常

raise exception_class(message, screen, stacktrace) 
selenium.common.exceptions.NoSuchElementException: Message: Unable to 
locate element:{"method":"xpath","selector":"//[@id='searchresults']/tbody/tr[2]/td[1]"} 
Stacktrace: 
at FirefoxDriver.prototype.findElementInternal_ (file:///c:/users/home/appdata/local/temp/tmpeglp49/extensions/fxdriver@googlecode.com/components/driver-component.js:10723) 
at FirefoxDriver.prototype.findElement (file:///c:/users/home/appdata/local/temp/tmpeglp49/extensions/fxdriver@googlecode.com/components/driver-component.js:10732) 
at DelayedCommand.prototype.executeInternal_/h (file:///c:/users/home/appdata/local/temp/tmpeglp49/extensions/fxdriver@googlecode.com/components/command-processor.js:12614) 
at DelayedCommand.prototype.executeInternal_ (file:///c:/users/home/appdata/local/temp/tmpeglp49/extensions/fxdriver@googlecode.com/components/command-processor.js:12619) 
at DelayedCommand.prototype.execute/< (file:///c:/users/home/appdata/local/temp/tmpeglp49/extensions/fxdriver@googlecode.com/components/command-processor.js:12561) 

代碼：

from selenium import webdriver 
from texttable import len 
from selenium.common.exceptions import NoSuchElementException 
from selenium.webdriver.support import expected_conditions as EC 
from selenium.common.exceptions import TimeoutException 
from selenium.webdriver.common.by import By 
from selenium.webdriver.support.wait import WebDriverWait 
driver=webdriver.Firefox() 
driver.get('https://jobs.ericsson.com/search/') 
driver.maximize_window() 
driver.find_element_by_css_selector('[type="text"][id="keywordsearch-q"]').send_keys('Python') 
driver.find_element_by_css_selector('[class="btn"][type="submit"]').click() 
i=len("//*[@id='searchresults']/tbody/tr/td") 
for j in range(1,i+1): 
    driver.find_element_by_xpath("//*[@id='searchresults']/tbody/tr[%d]/td[1]"%j).click() 
    print driver.find_element_by_id("job-title").text 
    driver.back() 
    continue 

問題2： 爲什麼列表的長度是越來越顯示爲12，但他們只有5種HERF元素在裏面 ？

from selenium import webdriver 
from texttable import len 
from selenium.common.exceptions import NoSuchElementException 
from selenium.webdriver.support import expected_conditions as EC 
from selenium.common.exceptions import TimeoutException 
from selenium.webdriver.common.by import By 
from selenium.webdriver.support.wait import WebDriverWait 
driver=webdriver.Firefox() 
driver.delete_all_cookies() 
driver.get('https://jobs.ericsson.com/search/') 
driver.maximize_window() 
driver.find_element_by_css_selector('[type="text"][id="keywordsearch-q"]').send_keys('Python') 
driver.find_element_by_css_selector('[class="btn"][type="submit"]').click() 
#currenturl = driver.current_url 
pages=driver.find_elements_by_css_selector('a[rel="nofollow"]') 
print pages 
print 'Its working' 
pages1=[] 
for page1 in pages: 
    pages1.append(page1.get_attribute('href')) 
    print int(len(pages1)) 

問題3： 如何獲得元素下的HTML標籤

a.How得到的B標籤1-25和104分別下？

請參考網址：

<div class="paginationShell clearfix" lang="en_US" xml:lang="en_US"> 
<div class="pagination well well-small"> 
<span class="pagination-label-row"> 
<span class="paginationLabel"> 
Results 
<b>1 – 25</b> 
    of 
<b>104</b> 
</span> 

b.How https://jobs.ericsson.com/search/?q=Python（在頁面的底部，結果部分越來越顯示），以獲得從HTML作業ID？

<div class="job"> 
<span itemprop="description"> 
<b>Req ID:</b> 
128378 
<br/> 
<br/> 

Answer 1

請嘗試以下操作：

for job in range(len(driver.find_elements_by_class_name('jobTitle-link'))): 
    driver.implicitly_wait(5) 
    driver.find_elements_by_class_name('jobTitle-link')[job].click() 
    print driver.find_element_by_id("job-title").text 
    driver.back() 

Answer 2

這可能會或可能不會幫助你，但根據我自己的經驗，我一般遇到這樣的錯誤，當我的網頁還沒有完全加載。在搜索元素之前添加一個time.sleep(1)通常解決了我的問題（如果代碼是正確的）。

​​

Answer 3

這裏是一個有效的解決方案，這個想法是不要點擊每一個環節上，而該URL存儲在一個列表中，然後導航到它：

from selenium import webdriver 
from texttable import len 
from selenium.common.exceptions import NoSuchElementException 
from selenium.webdriver.support import expected_conditions as EC 
from selenium.common.exceptions import TimeoutException 
from selenium.webdriver.common.by import By 
from selenium.webdriver.support.wait import WebDriverWait 

driver=webdriver.Firefox() 
driver.get('https://jobs.ericsson.com/search/') 
driver.maximize_window() 
driver.find_element_by_css_selector('[type="text"][id="keywordsearch-q"]').send_keys('Python') 
driver.find_element_by_css_selector('[class="btn"][type="submit"]').click() 

#To further process preserve the current url  
currenturl = driver.current_url 
#Get all the elements by class name 
jobs = driver.find_elements_by_class_name('jobTitle-link') 
jobslink = [] 
#Get hyperlink urls from the jobs elements 
#This way we avoid clicking each link and going back to the previous page 
for job in jobs: 
    jobslink.append(job.get_attribute('href')) 
#Get each element page 
for job in jobslink: 
    driver.get(job) 
    print driver.find_element_by_id("job-title").text