1. 首页
  2. 文章中心
  3. 所谓爬虫

爬虫06 —— seleniumSelenium

93 阅读 0 评论
我是靠谱客的博主 淡淡朋友，这篇文章主要介绍爬虫06 —— seleniumSelenium，现在分享给大家，希望可以做个参考。

Selenium

一、基本使用

复制代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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()

1、声明浏览器对象

复制代码
1
2
3
4
5
6
7
from selenium import webdriver
browser = webdriver.Chrome()
browser = webdriver.Firefox()
browser = webdriver.Edge()
browser = webdriver.PhantomJS()
browser = webdriver.Safari()

2、访问页面

复制代码
1
2
3
4
5
6
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.taobao.com')
print(browser.page_source)
browser.close()

二、查找元素

1、单个元素

复制代码
1
2
3
4
5
6
7
8
9
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()
复制代码
1
2
<selenium.webdriver.remote.webelement.WebElement (session="5e53d9e1c8646e44c14c1c2880d424af", element="0.5649563096161541-1")> <selenium.webdriver.remote.webelement.WebElement (session="5e53d9e1c8646e44c14c1c2880d424af", element="0.5649563096161541-1")> <selenium.webdriver.remote.webelement.WebElement (session="5e53d9e1c8646e44c14c1c2880d424af", element="0.5649563096161541-1")>
  • 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
复制代码
1
2
3
4
5
6
7
8
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()
复制代码
1
2
<selenium.webdriver.remote.webelement.WebElement (session="1f209c0d11551c40d9d20ad964fef244", element="0.07914603542731591-1")>

2、多个元素

复制代码
1
2
3
4
5
6
7
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()
复制代码
1
2
[<selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-1")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-2")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-3")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-4")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-5")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-6")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-7")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-8")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-9")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-10")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-11")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-12")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-13")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-14")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-15")>, <selenium.webdriver.remote.webelement.WebElement (session="c26290835d4457ebf7d96bfab3740d19", element="0.09221044033125603-16")>]
复制代码
1
2
3
4
5
6
7
8
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()
复制代码
1
2
[<selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-1")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-2")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-3")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-4")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-5")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-6")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-7")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-8")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-9")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-10")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-11")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-12")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-13")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-14")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-15")>, <selenium.webdriver.remote.webelement.WebElement (session="bca1503cd36be550e8dba984b55c5d0e", element="0.7914623408963901-16")>]
  • 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

三、元素交互操作

对获取的元素调用交互方法

复制代码
1
2
3
4
5
6
7
8
9
10
11
12
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()

更多操作: http://selenium-python.readthedocs.io/api.html#module-selenium.webdriver.remote.webelement

四、交互动作

将动作附加到动作链中串行执行

复制代码
1
2
3
4
5
6
7
8
9
10
11
12
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()

更多操作: http://selenium-python.readthedocs.io/api.html#module-selenium.webdriver.common.action_chains

五、执行JavaScript

复制代码
1
2
3
4
5
6
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")')

六、获取元素信息

1、获取属性

复制代码
1
2
3
4
5
6
7
8
9
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'))
复制代码
1
2
3
<selenium.webdriver.remote.webelement.WebElement (session="e08c0f28d7f44d75ccd50df6bb676104", element="0.7236390660048155-1")>
zu-top-link-logo

2、获取文本值

复制代码
1
2
3
4
5
6
7
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.text)
复制代码
1
2
提问

3、获取ID、位置、标签名、大小

复制代码
1
2
3
4
5
6
7
8
9
10
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)
复制代码
1
2
3
4
5
0.6822924344980397-1
{'y': 7, 'x': 774}
button
{'height': 32, 'width': 66}

七、Frame

复制代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
import time
from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
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')
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)
复制代码
1
2
3
4
5
<selenium.webdriver.remote.webelement.WebElement (session="4bb8ac03ced4ecbdefef03ffdc0e4ccd", element="0.44746093888932004-1")>
NO LOGO
<selenium.webdriver.remote.webelement.WebElement (session="4bb8ac03ced4ecbdefef03ffdc0e4ccd", element="0.13792611320464965-2")>
RUNOOB.COM

八、等待

1、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，隐式等待将等待一段时间再查找 DOM，默认的时间是0

复制代码
1
2
3
4
5
6
7
from selenium import webdriver
browser = webdriver.Chrome()
browser.implicitly_wait(10)
browser.get('https://www.zhihu.com/explore')
input = browser.find_element_by_class_name('zu-top-add-question')
print(input)
复制代码
1
2
<selenium.webdriver.remote.webelement.WebElement (session="b29214772d59e912f1ac52e96ed29abe", element="0.12886805191194894-1")>

2、显式等待

复制代码
1
2
3
4
5
6
7
8
9
10
11
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)
复制代码
1
2
<selenium.webdriver.remote.webelement.WebElement (session="07dd2fbc2d5b1ce40e82b9754aba8fa8", element="0.5642646294074107-1")> <selenium.webdriver.remote.webelement.WebElement (session="07dd2fbc2d5b1ce40e82b9754aba8fa8", element="0.5642646294074107-2")>
  • 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’)
  • visibility_of_element_located 元素可见，传入定位元组
  • visibility_of 可见，传入元素对象
  • presence_of_all_elements_located 所有元素加载出
  • text_to_be_present_in_element 某个元素文本包含某文字
  • text_to_be_present_in_element_value 某个元素值包含某文字
  • frame_to_be_available_and_switch_to_it frame加载并切换
  • invisibility_of_element_located 元素不可见
  • element_to_be_clickable 元素可点击
  • staleness_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 传入元素对象以及状态，相等返回True，否则返回False
  • element_located_selection_state_to_be 传入定位元组以及状态，相等返回True，否则返回False
  • alert_is_present 是否出现Alert

详细内容：http://selenium-python.readthedocs.io/api.html#module-selenium.webdriver.support.expected_conditions

九、前进后退

复制代码
1
2
3
4
5
6
7
8
9
10
11
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()

十、Cookies

复制代码
1
2
3
4
5
6
7
8
9
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.zhihu.com/explore')
print(browser.get_cookies())
browser.add_cookie({'name': 'name', 'domain': 'www.zhihu.com', 'value': 'germey'})
print(browser.get_cookies())
browser.delete_all_cookies()
print(browser.get_cookies())
复制代码
1
2
3
4
[{'secure': False, 'value': '"NGM0ZTM5NDAwMWEyNDQwNDk5ODlkZWY3OTkxY2I0NDY=|1491604091|236e34290a6f407bfbb517888849ea509ac366d0"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'l_cap_id', 'expiry': 1494196091.403418}, {'secure': False, 'value': '"YWEyOGY4MmI1MzQ2NGY5MmFiMjgzZGUzZWJjYTgwYjY=|1491604091|ff946847ddb5881245bdb7a5e6401b70dc61013f"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'cap_id', 'expiry': 1494196091.402855}, {'secure': False, 'value': '1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'l_n_c'}, {'secure': False, 'value': '"MjcxMDE3YzU1YjI4NDljZjljNTQ4ZDIyOWJjZTBhNmY=|1491604091|8da4722b56a1545c2020dba97394a220c0eca8d9"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'r_cap_id', 'expiry': 1494196091.402525}, {'secure': False, 'value': '51854390', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmc'}, {'secure': False, 'value': '"AADCo7e1kguPTqvEOMieRUzwkA7ZUBhV-VY=|1491604091"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'd_c0', 'expiry': 1586212091.344773}, {'secure': False, 'value': '51854390.1491604091.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmz', 'expiry': 1507372091}, {'secure': False, 'value': '3cc99fc5-8706-43fc-90ac-3ad991bd1a25', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '_zap', 'expiry': 1554676091}, {'secure': False, 'value': '97cb00128ccb46659728f7c69cc191b0|1491604091000|1491604091000', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'q_c1', 'expiry': 1586212091.401644}, {'secure': False, 'value': '51854390.2.10.1491604091', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmb', 'expiry': 1491605891}, {'secure': False, 'value': '1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'n_c'}, {'secure': False, 'value': '51854390.000--|3=entry_date=20170408=1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmv', 'expiry': 1554676091}, {'secure': False, 'value': '51854390.669300758.1491604091.1491604091.1491604091.1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utma', 'expiry': 1554676091}, {'secure': False, 'value': '1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmt', 'expiry': 1491604691}, {'secure': False, 'value': 'AQAAALCZuwh+dgIAeu3PPHA+csDPnXvT', 'domain': 'www.zhihu.com', 'path': '/', 'httpOnly': True, 'name': 'aliyungf_tc'}]
[{'secure': False, 'value': 'germey', 'domain': '.www.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'name'}, {'secure': False, 'value': '"NGM0ZTM5NDAwMWEyNDQwNDk5ODlkZWY3OTkxY2I0NDY=|1491604091|236e34290a6f407bfbb517888849ea509ac366d0"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'l_cap_id', 'expiry': 1494196091.403418}, {'secure': False, 'value': '"YWEyOGY4MmI1MzQ2NGY5MmFiMjgzZGUzZWJjYTgwYjY=|1491604091|ff946847ddb5881245bdb7a5e6401b70dc61013f"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'cap_id', 'expiry': 1494196091.402855}, {'secure': False, 'value': '1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'l_n_c'}, {'secure': False, 'value': '"MjcxMDE3YzU1YjI4NDljZjljNTQ4ZDIyOWJjZTBhNmY=|1491604091|8da4722b56a1545c2020dba97394a220c0eca8d9"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'r_cap_id', 'expiry': 1494196091.402525}, {'secure': False, 'value': '51854390', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmc'}, {'secure': False, 'value': '"AADCo7e1kguPTqvEOMieRUzwkA7ZUBhV-VY=|1491604091"', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'd_c0', 'expiry': 1586212091.344773}, {'secure': False, 'value': '51854390.1491604091.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmz', 'expiry': 1507372091}, {'secure': False, 'value': '3cc99fc5-8706-43fc-90ac-3ad991bd1a25', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '_zap', 'expiry': 1554676091}, {'secure': False, 'value': '97cb00128ccb46659728f7c69cc191b0|1491604091000|1491604091000', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'q_c1', 'expiry': 1586212091.401644}, {'secure': False, 'value': '51854390.2.10.1491604091', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmb', 'expiry': 1491605891}, {'secure': False, 'value': '1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': 'n_c'}, {'secure': False, 'value': '51854390.000--|3=entry_date=20170408=1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmv', 'expiry': 1554676091}, {'secure': False, 'value': '51854390.669300758.1491604091.1491604091.1491604091.1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utma', 'expiry': 1554676091}, {'secure': False, 'value': '1', 'domain': '.zhihu.com', 'path': '/', 'httpOnly': False, 'name': '__utmt', 'expiry': 1491604691}, {'secure': False, 'value': 'AQAAALCZuwh+dgIAeu3PPHA+csDPnXvT', 'domain': 'www.zhihu.com', 'path': '/', 'httpOnly': True, 'name': 'aliyungf_tc'}]
[]

十、选项卡管理

复制代码
1
2
3
4
5
6
7
8
9
10
11
12
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')
复制代码
1
2
['CDwindow-4f58e3a7-7167-4587-bedf-9cd8c867f435', 'CDwindow-6e05f076-6d77-453a-a36c-32baacc447df']

十一、异常处理

复制代码
1
2
3
4
5
from selenium import webdriver
browser = webdriver.Chrome()
browser.get('https://www.baidu.com')
browser.find_element_by_id('hello')
复制代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
---------------------------------------------------------------------------
NoSuchElementException
Traceback (most recent call last)
<ipython-input-23-978945848a1b> in <module>()
3 browser = webdriver.Chrome()
4 browser.get('https://www.baidu.com')
----> 5 browser.find_element_by_id('hello')
/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in find_element_by_id(self, id_)
267
driver.find_element_by_id('foo')
268
"""
--> 269
return self.find_element(by=By.ID, value=id_)
270
271
def find_elements_by_id(self, id_):
/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in find_element(self, by, value)
750
return self.execute(Command.FIND_ELEMENT, {
751
'using': by,
--> 752
'value': value})['value']
753
754
def find_elements(self, by=By.ID, value=None):
/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py in execute(self, driver_command, params)
234
response = self.command_executor.execute(driver_command, params)
235
if response:
--> 236
self.error_handler.check_response(response)
237
response['value'] = self._unwrap_value(
238
response.get('value', None))
/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py in check_response(self, response)
190
elif exception_class == UnexpectedAlertPresentException and 'alert' in value:
191
raise exception_class(message, screen, stacktrace, value['alert'].get('text'))
--> 192
raise exception_class(message, screen, stacktrace)
193
194
def _value_or_default(self, obj, key, default):
NoSuchElementException: Message: no such element: Unable to locate element: {"method":"id","selector":"hello"}
(Session info: chrome=57.0.2987.133)
(Driver info: chromedriver=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9),platform=Mac OS X 10.12.3 x86_64)
复制代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
from selenium import webdriver
from selenium.common.exceptions import TimeoutException, NoSuchElementException
browser = webdriver.Chrome()
try:
browser.get('https://www.baidu.com')
except TimeoutException:
print('Time Out')
try:
browser.find_element_by_id('hello')
except NoSuchElementException:
print('No Element')
finally:
browser.close()
复制代码
1
2
No Element

详细文档：http://selenium-python.readthedocs.io/api.html#module-selenium.common.exceptions

最后

以上就是淡淡朋友最近收集整理的关于爬虫06 —— seleniumSelenium的全部内容，更多相关爬虫06内容请搜索靠谱客的其他文章。

本图文内容来源于网友提供，作为学习参考使用，或来自网络收集整理，版权属于原作者所有。
点赞(62)

相关文章

python获取页面元素的内容及长度
python获取页面元素的内容及长度
Selenium笔记（3）Remote Webdriver
Selenium笔记（3）Remote Webdriver
Selenium IDE 进阶部分-UI-Element
Selenium IDE 进阶部分-UI-Element
python3 在webelement对象里面获取元素路径的方法
python3 在webelement对象里面获取元素路径的方法
爬虫06 —— seleniumSelenium
爬虫06 —— seleniumSelenium
python列表定位元素位置_在Selenium中定位元素的屏幕位置（使用Python）
python列表定位元素位置_在Selenium中定位元素的屏幕位置（使用Python）
用Selenium WebDriver判断WebElement是否存在时的问题
用Selenium WebDriver判断WebElement是否存在时的问题
Python爬虫从入门到精通——高级框架Selenium的使用（二）：节点操作
Python爬虫从入门到精通——高级框架Selenium的使用（二）：节点操作

评论列表共有 0 条评论

立即
投稿
返回
顶部