Selenium
自动化测试工具，支持多种浏览器；
爬虫中主要用来解决JavaScript渲染问题。
用法详解
基本使用
声明浏览器对象
from selenium import webdriver
browser = webdriver.Chrome()
browser = webdriver.Firefox()
browser = webdriver.Edge()
browser = webdriver.PhantomJS()
browser = webdriver.Safari()访问页面
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
print(browser.page_source)
browser.close()查找元素
单个元素
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
input_first = browser.find_element_by_id('q')
input_second = browser.find_element_by_css_selector('#q')
input_third = browser.find_element_by_xpath('//*[@id="q"]')
print(input_first, input_second, input_third)#这些方法效果是同样的
browser.close()一样的方法
from selenium import webdriver
from selenium.webdriver.common.by import By browser = webdriver.Chrome() browser.get('https://www.taobao.com') input_first = browser.find_element(By.ID,'q') print(input_first) browser.close()多个元素
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
lis = browser.find_elements_by_css_selector('.service-bd Ii')
print(lis)
browser.close()from selenium import webdriver
from selenium.webdriver.common.by import By browser = webdriver.Chrome() browser.get('https://www.taobao.com') lis = browser.find_elements(By.CSS_SELECTOR,'.service-bd li') print(lis) browser.close()元素交互操作
对获取的元素调用交互方法
交互动作
将动作附加到动作链中串行执行
执行JavaScript
获取元素信息
Frame
等待
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