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python selenium
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![python selenium](/upload/InfoBanner/zyjiaocheng/851/57170d1f1c1b4237a8415aaf52cfa505.jpg)
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渲染的问题
安装Selenium
pip3 isntall selenium
Selenium
基本使用
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
browser = webdriver.Chrome()
try:
browser.get('https://www.baidu.com')
input = browser.find_element_by_id('kw')
input.send_keys('Python')
input.send_keys(Keys.ENTER)
wait = WebDriverWait(browser,10)
wait.until(EC.presence_of_element_located((By.ID,'content_left')))
print(browser.current_url)
print(browser.get_cookies())
print(browser.page_source)
finally:
browser.close()
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
from selenium import webdriver
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)
browser.close()
- find_element_by_name
- find_element_by_xpath
- find_element_by_link_text
- find_element_by_partial_link_text
- find_element_by_tag_name
- find_element_by_class_name
- find_element_by_css_selector
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 li')
print(lis)
browser.close()
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
lis = broser.find_elements(By.CSS_SELECTOR,'.service-bd li')
print(lis)
browser.close()
- find_elements_by_name
- find_elements_by_xpath
- find_elements_by_link_text
- find_elements_by_partial_link_text
- find_elements_by_tag_name
- find_elements_by_class_name
- find_elements_by_css_selector
元素交互操作
对获取的元素调用交互方法
from selenium import webdriver
import time
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
input = browser.find_element_by_id('q')
input.send_keys('iPhone')
time.sleep(1)
input.clear()
input.send_keys('iPad')
button = browser.find_element_by_class_name('btn-search')
button.click()
交互动作
将动作附加到动作链中串行执行
from selenium import webdriver
from selenium.webdriver import ActionChains
browser = webdriver.Chrome()
url='http://www.runoob.com/try/try.php?filename=jqueryui-api-droppable'
browser.get(url)
browser.switch_to.frame('iframeResult')
source = browser.find_element_by_css_selector('#draggable')
target = browser.find_element_by_css_selector('#droppable')
actions = ActionChains(browser)
actions.drag_and_drop(source,target)
actions.perform()
执行JavaScript
from selenium import webdriver
browser.get("https://www.zhihu.com/explore")
browser.execute_script('window.scrollTo(0,document.body.scrollHeight)')
browser.execute_script('alert('To Bottom')')
获取元素信息
获取属性
from selenium import webdriver
from selenium.webdriver import ActionChains
browser = webdriver.Chrome()
url = 'https://www.zhihu.com/explore'
browser.get(url)
logo = browser.find_element_by_id('zh-top-link-logo')
print(logo)
print(logo.get_attribute('class'))
获取文本值
from selenium import webdriver
from selenium.webdriver import ActionChains
browser = webdriver.Chrome()
url = 'https://www.zhihu.com/explore'
browser.get(url)
input = browser.find_element_by_class_name('zu-top-add-question')
print(input.text)
获取ID、位置、标签名、大小
from selenium import webdriver
browser = webdriver.Chrome()
url='https://www.zhihu.com/explore'
browser.get(url)
input = browser.find_element_by_class_name('zu-top-add-question')
print(input.id)
print(input.location)
print(input.tag_name)
print(input.size)
Frame
import time
from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
url='http://www.runoob.com/try/try.php?filename=jqueryui-api-droppable'
browser.get(url)
browser.switch_to.frame('iframeResult')
source = browser.find_element_by_css_selector('#draggable')
print(source)
try:
logo = browser.find_element_by_class_name('logo')
except NoSuchElementException:
print('NO LOGO')
browser.switch_to.parent_frame()
logo = browser.find_element_by_class_name('logo')
print(logo)
print(logo.text)
等待
隐式等待
当使用了隐式等待执行测试的时候,如果WebDriver没有在DOM中找到元素,将继续等待,超出设定时间后则抛出找不到元素的异常,换句话说,当查找元素或元素并没有立即出现的时候,隐式等待将等待一端时间再查找DOM,默认时间是0
from selenium import webdriver
browser.implicitly_wait(10)
browser.get('https://www.zhihu.com/explore')
input = browser.find_element_by_class_name('zu-top-add-question')
print(input)
显示等待
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
browser = webdriver.Chrome()
browser.get('https://www.taobao.com/')
wait = WebDriverWait(browser,10)
input = wait.until(EC.presence_of_element_located((By.ID,'q')))
button = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,'btn-search')))
print(input,button)
- title_is标题是某内容
- title_contains标题包含某内容
- presence_of_element_located 元素加载出,传入定位元组,如(By.ID,'p')
- visility_of_element_located元素可见,传入定位元组
- visility_of可见,传入元素对象
- presence_of_all_elements_located所有元素加载出
- text_to_be_avalable_and_switch_to_it frame加载并切换
- invisibity_of_element_located元素不可见
- element_to_be_clickable元素可点击
- stateness_of判断一个元素是否仍在DOM,可判断页面是否已经刷新
- element_to_be_selected元素可选择,传元素对象
- element_located_to_be_selected元素可选择,传入定位元组
- element_selection_state_to_be传入元素对象从状态,相等返回True,否则返回False
- alert_is_prosent是否出现Alert
前进后退
import time
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.baidu.com/')
browser.get('https://www.taobao.com/')
browser.get('https://www.python.org/')
browser.back
time.sleep(1)
browser.forward()
browser.close()
cookies
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.zhihu.com')
print(browser.get_cookies())
browser.add_cookies{'name':'name','domain':'www.zhihu.com','value':'puqunzhu'}
print(browser.get_cookies())
browser.delete_all_cookies()
print(browser.get_cookies())
选项卡管理
import time
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.baidu.com')
browser.execute_script('window.open()')
print(browser.window_handles)
browser.switch_to_window(browser.window_handles[1])
browser.get('https://www.taobao.com')
time.sleep(1)
browser.switch_to_window(browser.window_handles[0])
browser.get('https://python.org')
异常处理
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.baidu.com')
browser.find_element_by_id('hello')
from selenium import webdriver
from selenium.common.exceptions import TimeoutException,NoSuchElementException
browser = webdriver.Chrome()
try:
browser.get('http://www.baidu.com')
except TimeoutException:
print('Time Out')
except NoSuchElementException:
print('No Element')
finally:
browser.close()
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