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使用Selenium操纵浏览器

王成军

wangchengjun@nju.edu.cn

计算传播网 http://computational-communication.com

selenium 是一套完整的web应用程序测试系统，包含了

  • 测试的录制（selenium IDE）
  • 编写及运行（Selenium Remote Control）
  • 测试的并行处理（Selenium Grid）。

Selenium的核心Selenium Core基于JsUnit，完全由JavaScript编写，因此可以用于任何支持JavaScript的浏览器上。selenium可以模拟真实浏览器，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。https://www.cnblogs.com/zhaof/p/6953241.html

Webdriver

用python写爬虫的时候，主要用的是selenium的Webdriver，我们可以通过下面的方式先看看Selenium.Webdriver支持哪些浏览器





In [4]:



    


from selenium import webdriver



    











In [5]:



    


help(webdriver)



    


















    






Help on package selenium.webdriver in selenium:

NAME
    selenium.webdriver

DESCRIPTION
    # Licensed to the Software Freedom Conservancy (SFC) under one
    # or more contributor license agreements.  See the NOTICE file
    # distributed with this work for additional information
    # regarding copyright ownership.  The SFC licenses this file
    # to you under the Apache License, Version 2.0 (the
    # "License"); you may not use this file except in compliance
    # with the License.  You may obtain a copy of the License at
    #
    #   http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing,
    # software distributed under the License is distributed on an
    # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    # KIND, either express or implied.  See the License for the
    # specific language governing permissions and limitations
    # under the License.

PACKAGE CONTENTS
    android (package)
    blackberry (package)
    chrome (package)
    common (package)
    edge (package)
    firefox (package)
    ie (package)
    opera (package)
    phantomjs (package)
    remote (package)
    safari (package)
    support (package)
    webkitgtk (package)

VERSION
    3.9.0

FILE
    /Users/datalab/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/__init__.py

PhantomJS

PhantomJS是一个而基于WebKit的服务端JavaScript API,支持Web而不需要浏览器支持，其快速、原生支持各种Web标准：Dom处理，CSS选择器，JSON等等。PhantomJS可以用用于页面自动化、网络监测、网页截屏，以及无界面测试

声明浏览器对象

上面我们知道了selenium支持很多的浏览器，但是如果想要声明并调用浏览器则需要： https://pypi.org/project/selenium/





In [6]:



    


#browser = webdriver.Firefox() # 打开Firefox浏览器
browser = webdriver.Chrome() # 打开Chrome浏览器

访问页面





In [8]:



    


from selenium import webdriver

browser = webdriver.Chrome()
 
browser.get("http://www.baidu.com") 
print(browser.page_source)
#browser.close()



    


















    






<!DOCTYPE html><!--STATUS OK--><html xmlns="http://www.w3.org/1999/xhtml"><head>
    
    <meta http-equiv="content-type" content="text/html;charset=utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
	<meta content="always" name="referrer" />
    <meta name="theme-color" content="#2932e1" />
    <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
    <link rel="search" type="application/opensearchdescription+xml" href="/content-search.xml" title="百度搜索" />
    <link rel="icon" sizes="any" mask="" href="//www.baidu.com/img/baidu_85beaf5496f291521eb75ba38eacbd87.svg" />
	
	
	<link rel="dns-prefetch" href="//s1.bdstatic.com" />
	<link rel="dns-prefetch" href="//t1.baidu.com" />
	<link rel="dns-prefetch" href="//t2.baidu.com" />
	<link rel="dns-prefetch" href="//t3.baidu.com" />
	<link rel="dns-prefetch" href="//t10.baidu.com" />
	<link rel="dns-prefetch" href="//t11.baidu.com" />
	<link rel="dns-prefetch" href="//t12.baidu.com" />
	<link rel="dns-prefetch" href="//b1.bdstatic.com" />
    
    <title>百度一下，你就知道</title>
    

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#wrapper .bdbri.bdbriimg .bdbrievenmore{margin-top:15px;height:30px;width:85px;overflow:hidden}
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.c-slink-new-strong:visited{color:#000}[data-pmd] .c-slink-new-strong:active{background-color:#e5e5e5}[data-pmd] .c-slink-auto{display:inline-block;max-width:100%;height:.3rem;line-height:.3rem;background-color:#f5f5f5;font-size:.14rem;color:#000;text-align:center;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 .1rem;border-radius:3px;vertical-align:middle;outline:0;-webkit-tap-highlight-color:rgba(0,0,0,0)}[data-pmd] .c-slink-auto:active{background-color:#e5e5e5}[data-pmd] .c-slink-auto:visited{color:#000}[data-pmd] .c-text{display:inline-block;height:14px;padding:0 2px;margin-bottom:2px;text-decoration:none;vertical-align:middle;color:#fff;font-size:10px;line-height:15px;font-style:normal;font-weight:400;overflow:hidden;border-radius:2px}[data-pmd] .c-text-danger{background-color:#f13f40}[data-pmd] .c-text-public{background-color:#2b99ff}[data-pmd] .c-text-box{display:inline-block;padding:1px 2px;margin-bottom:2px;text-decoration:none;vertical-align:middle;font-size:10px;line-height:11px;height:10px;font-style:normal;font-weight:400;overflow:hidden;-webkit-box-sizing:content-box;box-sizing:content-box;border-radius:2px}[data-pmd] .c-text-box-gray{color:#999;border:1px solid #e3e3e3}[data-pmd] .c-text-box-orange{color:#f60;border:1px solid #f3d9c5}[data-pmd] .c-text-box-pink{color:#ff4683;border:1px solid #ffc7da}[data-pmd] .c-text-box-red{color:#f13f40;border:1px solid #efb9b9}[data-pmd] .c-text-box-blue{color:#2b99ff;border:1px solid #b3d4f3}[data-pmd] .c-text-box-green{color:#65b12c;border:1px solid #d7efc6}[data-pmd] .c-text-box-yellow{color:#faa90e;border:1px solid #feecc9}[data-pmd] .c-text-info{display:inline;color:#999;font-style:normal;font-weight:400;font-family:sans-serif}[data-pmd] .c-index{display:inline-block;height:15px;margin:0 5px 3px 0;text-align:center;vertical-align:middle;color:#999;font-size:14px;line-height:15px;overflow:hidden}[data-pmd] 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auto;width:16.66666667%;list-style:none;text-decoration:none;height:.38rem;line-height:.38rem;color:#555;text-align:center;text-overflow:ellipsis;white-space:nowrap;overflow:hidden;-webkit-tap-highlight-color:rgba(0,0,0,0)}[data-pmd] .c-tabs-nav .c-tabs-nav-selected{color:#000;border-bottom:1px solid #000}[data-pmd] .c-tabs-nav-bottom{border-top:1px solid #f1f1f1;padding:0}[data-pmd] .c-tabs-nav-bottom .c-tabs-nav-li{color:#999}[data-pmd] .c-tabs-nav-bottom .c-tabs-nav-icon{display:none}[data-pmd] .c-tabs-nav-bottom .c-tabs-nav-selected{position:relative;top:-1px;height:.38rem;line-height:.39rem;color:#000;background-color:#fff;border-bottom:1px solid #000;border-top-color:#fff}[data-pmd] .c-tabs-nav-bottom .c-tabs-nav-selected:first-child{margin-left:-1px}[data-pmd] .c-tabs-nav-bottom .c-tabs-nav-selected .c-tabs-nav-icon{display:inline-block;width:.15rem;height:.15rem}[data-pmd] .c-tabs-nav-view{position:relative;height:.38rem;background-color:#f5f5f5;overflow:hidden}[data-pmd] 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cubic-bezier(0.7,0,.3,1);transform:translate3d(0,0,0);-webkit-transform:translate3d(0,0,0);-moz-transition:translate3d(0,0,0);-o-transition:translate3d(0,0,0)}[data-pmd] .c-tabs-animation .c-tabs-view-content{margin:0 -.17rem;overflow:hidden}[data-pmd] .c-tabs-animation .c-tabs-content{position:relative;padding-left:.17rem;padding-right:.17rem;box-sizing:border-box;float:left;display:none}[data-pmd] .c-tabs-animation .c-tabs-selected{display:block}[data-pmd] .c-tabs-animation .c-tabs-view-content-anim{transition:height .3s cubic-bezier(0.7,0,.3,1);-webkit-transition:height .3s cubic-bezier(0.7,0,.3,1);-moz-transition:height .3s cubic-bezier(0.7,0,.3,1);-o-transition:height .3s cubic-bezier(0.7,0,.3,1);transform:translate3d(0,0,0);-webkit-transform:translate3d(0,0,0);-moz-transition:translate3d(0,0,0);-o-transition:translate3d(0,0,0)}[data-pmd] .c-tabs-animation 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</body></html>

查找元素

单个元素查找





In [10]:



    


from selenium import webdriver

browser = webdriver.Chrome()

browser.get("http://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)
print(input_second)
print(input_third)
browser.close()



    


















    






<selenium.webdriver.remote.webelement.WebElement (session="6a5646a43c85d47ab922b3c0c18d0670", element="0.6661236082373989-1")>
<selenium.webdriver.remote.webelement.WebElement (session="6a5646a43c85d47ab922b3c0c18d0670", element="0.6661236082373989-1")>
<selenium.webdriver.remote.webelement.WebElement (session="6a5646a43c85d47ab922b3c0c18d0670", element="0.6661236082373989-1")>

这里我们通过三种不同的方式去获取响应的元素，第一种是通过id的方式，第二个中是CSS选择器，第三种是xpath选择器，结果都是相同的。

常用的查找元素方法：

  • find_element_by_name
  • find_element_by_id
  • 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




In [6]:



    


# 下面这种方式是比较通用的一种方式：这里需要记住By模块所以需要导入
from selenium.webdriver.common.by import By



    











In [7]:



    


browser = webdriver.Chrome()
browser.get("http://www.taobao.com")
input_first = browser.find_element(By.ID,"q")
print(input_first)
browser.close()



    


















    






<selenium.webdriver.remote.webelement.WebElement (session="70144c2330b5f8a6c1aa5b29f6f39fd7", element="0.9218566884447232-1")>

多个元素查找

其实多个元素和单个元素的区别，举个例子：find_elements,单个元素是find_element,其他使用上没什么区别，通过其中的一个例子演示：





In [8]:



    


browser = webdriver.Chrome()
browser.get("http://www.taobao.com")
lis = browser.find_elements_by_css_selector('.service-bd li')
print(lis)
browser.close()



    


















    






[<selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-1")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-2")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-3")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-4")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-5")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-6")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-7")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-8")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-9")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-10")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-11")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-12")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-13")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-14")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-15")>, <selenium.webdriver.remote.webelement.WebElement (session="9766da987c954bb3c45377f0103be015", element="0.9651686507128168-16")>]

当然上面的方式也是可以通过导入from selenium.webdriver.common.by import By 这种方式实现

lis = browser.find_elements(By.CSS_SELECTOR,'.service-bd li')

同样的在单个元素中查找的方法在多个元素查找中同样存在：

  • find_elements_by_name
  • find_elements_by_id
  • 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

对于获取的元素调用交互方法





In [12]:



    


from selenium import webdriver
import time
browser = webdriver.Chrome()
browser.get("http://www.taobao.com")



    











In [13]:



    


#browser.get("http://www.taobao.com")
input_str = browser.find_element_by_id('q')
input_str.send_keys("ipad")
time.sleep(3)
input_str.clear()
input_str.send_keys("MacBook pro")
button = browser.find_element_by_class_name('btn-search')
button.click()

运行的结果可以看出程序会自动打开Chrome浏览器并打开淘宝输入ipad,然后删除，重新输入MacBook pro，并点击搜索

Selenium所有的api文档：http://selenium-python.readthedocs.io/api.html#module-selenium.webdriver.common.action_chains

执行JavaScript

这是一个非常有用的方法，这里就可以直接调用js方法来实现一些操作， 下面的例子是通过登录知乎然后通过js翻到页面底部，并弹框提示





In [18]:



    


from selenium import webdriver
browser = webdriver.Chrome()
browser.get("https://www.zhihu.com/explore")
browser.execute_script('window.scrollTo(0, document.body.scrollHeight)')
browser.execute_script('alert("To Bottom")')

获取元素属性

get_attribute('class')





In [19]:



    


browser.get("http://www.zhihu.com/explore")
logo = browser.find_element_by_id('zh-top-link-logo')
print(logo)
print(logo.get_attribute('class'))



    


















    






---------------------------------------------------------------------------
NoSuchWindowException                     Traceback (most recent call last)
<ipython-input-19-29e0194e1f37> in <module>()
      1 browser.get("http://www.zhihu.com/explore")
----> 2 logo = browser.find_element_by_id('zh-top-link-logo')
      3 print(logo)
      4 print(logo.get_attribute('class'))

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in find_element_by_id(self, id_)
    349             element = driver.find_element_by_id('foo')
    350         """
--> 351         return self.find_element(by=By.ID, value=id_)
    352 
    353     def find_elements_by_id(self, id_):

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in find_element(self, by, value)
    953         return self.execute(Command.FIND_ELEMENT, {
    954             'using': by,
--> 955             'value': value})['value']
    956 
    957     def find_elements(self, by=By.ID, value=None):

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in execute(self, driver_command, params)
    310         response = self.command_executor.execute(driver_command, params)
    311         if response:
--> 312             self.error_handler.check_response(response)
    313             response['value'] = self._unwrap_value(
    314                 response.get('value', None))

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py in check_response(self, response)
    240                 alert_text = value['alert'].get('text')
    241             raise exception_class(message, screen, stacktrace, alert_text)
--> 242         raise exception_class(message, screen, stacktrace)
    243 
    244     def _value_or_default(self, obj, key, default):

NoSuchWindowException: Message: no such window: target window already closed
from unknown error: web view not found
  (Session info: chrome=74.0.3729.169)
  (Driver info: chromedriver=2.37.544337 (8c0344a12e552148c185f7d5117db1f28d6c9e85),platform=Mac OS X 10.14.5 x86_64)

获取文本值

text





In [27]:



    


browser.get("http://www.zhihu.com/explore")
input = browser.find_element_by_class_name('zu-top-add-question')
print(input.text)



    


















    






提问

获取ID，位置，标签名

id location tag_name size





In [28]:



    


browser.get("http://www.zhihu.com/explore")
input = browser.find_element_by_class_name('zu-top-add-question')
print(input.id)
print(input.location)
print(input.tag_name)
print(input.size)



    


















    






0.14881650366503973-1
{'x': 849, 'y': 7}
button
{'width': 66, 'height': 32}

一个例子





In [23]:



    


from selenium import webdriver
# import selenium.webdriver.support.ui as ui
browser = webdriver.Chrome()
browser.get("https://www.privco.com/home/login") #需要翻墙打开网址
username = 'wangchj04@126.com'
password =  'CityUniversityHK'
browser.find_element_by_id("username").clear()
browser.find_element_by_id("username").send_keys(username) 
browser.find_element_by_id("password").clear()
browser.find_element_by_id("password").send_keys(password)
browser.find_element_by_css_selector("#login-form > div:nth-child(5) > div > button").click()



    


















    






---------------------------------------------------------------------------
NoSuchElementException                    Traceback (most recent call last)
<ipython-input-23-9bb9d14c3482> in <module>()
      5 username = 'wangchj04@126.com'
      6 password =  'CityUniversityHK'
----> 7 browser.find_element_by_id("username").clear()
      8 browser.find_element_by_id("username").send_keys(username)
      9 browser.find_element_by_id("password").clear()

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in find_element_by_id(self, id_)
    349             element = driver.find_element_by_id('foo')
    350         """
--> 351         return self.find_element(by=By.ID, value=id_)
    352 
    353     def find_elements_by_id(self, id_):

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in find_element(self, by, value)
    953         return self.execute(Command.FIND_ELEMENT, {
    954             'using': by,
--> 955             'value': value})['value']
    956 
    957     def find_elements(self, by=By.ID, value=None):

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in execute(self, driver_command, params)
    310         response = self.command_executor.execute(driver_command, params)
    311         if response:
--> 312             self.error_handler.check_response(response)
    313             response['value'] = self._unwrap_value(
    314                 response.get('value', None))

~/Applications/anaconda/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py in check_response(self, response)
    240                 alert_text = value['alert'].get('text')
    241             raise exception_class(message, screen, stacktrace, alert_text)
--> 242         raise exception_class(message, screen, stacktrace)
    243 
    244     def _value_or_default(self, obj, key, default):

NoSuchElementException: Message: no such element: Unable to locate element: {"method":"id","selector":"username"}
  (Session info: chrome=74.0.3729.169)
  (Driver info: chromedriver=2.37.544337 (8c0344a12e552148c185f7d5117db1f28d6c9e85),platform=Mac OS X 10.14.5 x86_64)

















In [27]:



    


# url = "https://www.privco.com/private-company/329463"
def download_excel(url):
    browser.get(url)
    name = url.split('/')[-1]
    title = browser.title
    source = browser.page_source
    with open(name+'.html', 'w') as f:
        f.write(source)
    try:
        soup = BeautifulSoup(source, 'html.parser')
        url_new = soup.find('span', {'class', 'profile-name'}).a['href']
        url_excel = url_new + '/export'
        browser.get(url_excel)
    except Exception as e:
        print(url, 'no excel')
        pass



    











In [25]:



    


urls = [ 'https://www.privco.com/private-company/1135789',
        'https://www.privco.com/private-company/542756',
        'https://www.privco.com/private-company/137908',
        'https://www.privco.com/private-company/137138']



    











In [28]:



    


for k, url in enumerate(urls):
    print(k)
    try:
        download_excel(url)
    except Exception as e:
        print(url, e)



    


















    






0
https://www.privco.com/private-company/1135789 no excel
1
https://www.privco.com/private-company/542756 no excel
2
https://www.privco.com/private-company/137908 no excel
3
https://www.privco.com/private-company/137138 no excel

Content source: computational-class/cjc

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