python - BeautifulSoup 找不到元素

Question

我正在尝试编写一个程序来提取以下网站的价格。我正在使用 selenium 下载网站，然后尝试使用 beautifulsoup 或 selenium 本身对其进行解析。

我确定我想要的信息始终是 class="totalPrice"，我想将它们全部提取出来，最好是作为一个列表。

<td class="totalPrice" colspan="3">
Total: £560
<span class="sr_room_reinforcement"></span>
</td>

出于某种原因，以下查询从未找到任何总价。任何我做错的建议都将不胜感激。

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from bs4 import BeautifulSoup as bs

url='http://www.booking.com/searchresults.en-gb.html?label=gen173nr-17CAEoggJCAlhYSDNiBW5vcmVmaFCIAQGYAS64AQTIAQTYAQHoAQH4AQs;sid=1a43e0952558ac0ad0061d5b6523a7bc;dcid=1;checkin_monthday=4;checkin_year_month=2016-2;checkout_monthday=11;checkout_year_month=2016-2;city=-2601889;class_interval=1;csflt=%7B%7D;group_adults=7;group_children=0;highlighted_hotels=1192837;hp_sbox=1;label_click=undef;no_rooms=1;review_score_group=empty;room1=A%2CA%2CA%2CA%2CA%2CA%2CA;sb_price_type=total;score_min=0;si=ai%2Cco%2Cci%2Cre%2Cdi;ss=London;ssafas=1;ssb=empty;ssne=London;ssne_untouched=London&;order=price_for_two'
driver = webdriver.PhantomJS(r"C:\\Program Files (x86)\\phantomjs-2.0.0-windows\\bin\\phantomjs.exe")
#driver = webdriver.Firefox()
driver.get(url)

# for elm in driver.find_element_by_class_name("totalPrice"):
#     print(elm.text)

content = driver.page_source
soup = bs(content, 'lxml')
for e in soup.find_all('totalPrice'):
    print(e.name)

driver.close()

Answer 1

首先，您需要等待加载总价格。使用 WebDriverWait具有 precense_of_element_located 预期条件的类。

我还发现您需要通过 Desired 覆盖浏览器的 User-Agent 来假装不是 PhantomJS能力。

完整的工作代码:

from selenium import webdriver
from selenium.webdriver import DesiredCapabilities
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from bs4 import BeautifulSoup as bs

url = 'http://www.booking.com/searchresults.en-gb.html?label=gen173nr-17CAEoggJCAlhYSDNiBW5vcmVmaFCIAQGYAS64AQTIAQTYAQHoAQH4AQs;sid=1a43e0952558ac0ad0061d5b6523a7bc;dcid=1;checkin_monthday=4;checkin_year_month=2016-2;checkout_monthday=11;checkout_year_month=2016-2;city=-2601889;class_interval=1;csflt=%7B%7D;group_adults=7;group_children=0;highlighted_hotels=1192837;hp_sbox=1;label_click=undef;no_rooms=1;review_score_group=empty;room1=A%2CA%2CA%2CA%2CA%2CA%2CA;sb_price_type=total;score_min=0;si=ai%2Cco%2Cci%2Cre%2Cdi;ss=London;ssafas=1;ssb=empty;ssne=London;ssne_untouched=London&;order=price_for_two'

# setting a custom User-Agent
user_agent = (
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_4) " +
    "AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.57 Safari/537.36"
)

dcap = dict(DesiredCapabilities.PHANTOMJS)
dcap["phantomjs.page.settings.userAgent"] = user_agent

driver = webdriver.PhantomJS(desired_capabilities=dcap)
driver.get(url)

# wait for the total prices to become present
WebDriverWait(driver, 30).until(EC.presence_of_element_located((By.CSS_SELECTOR, ".totalPrice")))

content = driver.page_source
driver.close()

soup = bs(content, 'lxml')
for e in soup.select('.totalPrice'):
    print(e.text.strip())

它打印:

Total: US$781
Total: US$814
Total: US$831
Total: US$864
Total: US$895
Total: US$914
Total: US$915
Total: US$967
Total: US$1,031

---

作为旁注，您实际上并不需要 BeautifulSoup - 您可以 locate elements with selenium - 它非常强大。以下是查找总价的方法:

for price in driver.find_elements_by_css_selector(".totalPrice"):
    print(price.text.strip())