selenium優(yōu)勢

selenium使用流程：

1.環(huán)境安裝：pip install selenium

2.下載一個瀏覽器的驅(qū)動程序（谷歌瀏覽器）

3.實例化一個瀏覽器對象

代碼

from selenium import webdriverfrom lxml import etreefrom time import sleepif __name__ == ’__main__’: bro = webdriver.Chrome(r'E:googleChromeApplicationchromedriver.exe') bro.get(url=’http://scxk.nmpa.gov.cn:81/xk/’) page_text = bro.page_source tree = etree.HTML(page_text) li_list = tree.xpath(’//*[@id='gzlist']/li’) for li in li_list: name = li.xpath(’./dl/@title’)[0] print(name) sleep(5) bro.quit()基于瀏覽器自動化的操作

代碼

#編寫基于瀏覽器自動化的操作代碼- 發(fā)起請求: get(url)- 標簽定位: find系列的方法- 標簽交互: send_ keys( ’xxx’ )- 執(zhí)行js程序: excute_script(’jsCod’)- 前進，后退: back(),forward( )- 關(guān)閉瀏覽器: quit()

代碼

https://www.taobao.com/

from selenium import webdriverfrom time import sleepbro = webdriver.Chrome(executable_path=r'E:googleChromeApplicationchromedriver.exe')bro.get(url=’https://www.taobao.com/’)#標簽定位search_input = bro.find_element_by_id(’q’)sleep(2)#執(zhí)行一組js代碼，使得滾輪向下滑動bro.execute_script(’window.scrollTo(0,document.body.scrollHeight)’)sleep(2)#標簽交互search_input.send_keys(’女裝’)button = bro.find_element_by_class_name(’btn-search’)button.click()bro.get(’https://www.baidu.com’)sleep(2)bro.back()sleep(2)bro.forward()sleep(5)bro.quit()selenium處理iframe：

- 如果定位的標簽存在于iframe標簽之中，則必須使用switch_to.frame(id)- 動作鏈(拖動) : from selenium. webdriver import ActionChains- 實例化一個動作鏈對象: action = ActionChains (bro)- click_and_hold(div) :長按且點擊操作- move_by_offset(x,y)- perform( )讓動作鏈立即執(zhí)行- action.release( )釋放動作鏈對象

代碼

https://www.runoob.com/try/try.php?filename=jqueryui-api-droppable

from selenium import webdriverfrom time import sleepfrom selenium.webdriver import ActionChainsbro = webdriver.Chrome(executable_path=r'E:googleChromeApplicationchromedriver.exe')bro.get(’https://www.runoob.com/try/try.php?filename=jqueryui-api-droppable’)bro.switch_to.frame(’iframeResult’)div = bro.find_element_by_id(’draggable’)#動作鏈action = ActionChains(bro)action.click_and_hold(div)for i in range(5): action.move_by_offset(17,0).perform() sleep(0.3)#釋放動作鏈action.release()bro.quit()selenium模擬登陸QQ空間

代碼

https://qzone.qq.com/

from selenium import webdriverfrom time import sleepbro = webdriver.Chrome(executable_path=r'E:googleChromeApplicationchromedriver.exe')bro.get(’https://qzone.qq.com/’)bro.switch_to.frame('login_frame')switcher = bro.find_element_by_id(’switcher_plogin’)switcher.click()user_tag = bro.find_element_by_id(’u’)password_tag = bro.find_element_by_id(’p’)user_tag.send_keys(’1234455’)password_tag.send_keys(’qwer123’)sleep(1)but = bro.find_element_by_id(’login_button’)but.click()無頭瀏覽器和規(guī)避檢測

代碼

from selenium import webdriverfrom time import sleep#實現(xiàn)無可視化界面from selenium.webdriver.chrome.options import Options#實現(xiàn)規(guī)避檢測from selenium.webdriver import ChromeOptions#實現(xiàn)無可視化界面chrome_options = Options()chrome_options.add_argument(’--headless’)chrome_options.add_argument(’--disable-gpu’)#實現(xiàn)規(guī)避檢測option = ChromeOptions()option.add_experimental_option(’excludeSwitches’,[’enable-automation’])bro = webdriver.Chrome(executable_path=r'E:googleChromeApplicationchromedriver.exe',chrome_options=chrome_options,options=option)bro.get(’https://www.baidu.com’)print(bro.page_source)sleep(2)bro.quit()

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