抓取 -- <dt> 使用 PyQt4 的 JS 生成页面中的标签缺少文本元素

Question

我正在尝试使用 PyQt4 抓取此页面，但由于某种原因，当我使用 BeautifulSoup 搜索时，<dt>标签的文本元素没有显示。

我对使用 PyQt4 很陌生，所以我不确定这里出了什么问题。我得到了文本标签的所有文本元素，但没有获得.页面是否未完全加载或出了什么问题？任何帮助，不胜感激。

这是我到目前为止一直在使用的代码：

class Client(QWebPage):
    def __init__(self, url):
         print('nnLoading: n', url)
         self.app = QApplication(sys.argv)
         QWebPage.__init__(self)
         self.loadFinished.connect(self.on_page_load)
         self.mainFrame().load((QUrl(url)))
         self.app.exec()
         self.app.quit()
    def on_page_load(self):
        self.app.quit()
url = 'http://www.hkex.com.hk/Market-Data/Securities-Prices/Equities/Equities-Quote?sym=700&sc_lang=en'
client_response = Client(url)
source = client_response.mainFrame().toHtml()
soup = bs.BeautifulSoup(source, 'lxml')

table = soup.find('div', {'class' : 'left_list_leve quote'})
price =  soup.find('span' , {'class' : 'col_last'})
name = soup.find('p' , {'class' : 'col_name'})
all_dls = table.findAll('dl')

这是我在运行脚本后得到的结果。

   Loading:
 http://www.hkex.com.hk/Market-Data/Securities-Prices/Equities/Equities-Quote?sym=700&sc_lang=en
[<dl>
<dd class="ico_name label_prevcls">PREV. CLOSE*</dd>
<dt class="ico_data col_prevcls"></dt>
</dl>, <dl>
<dd class="ico_name label_open">OPEN**</dd>
<dt class="ico_data col_open"></dt>
</dl>, <dl>
<dd class="ico_name label_turnover">TURNOVER</dd>
<dt class="ico_data col_turnover"></dt>
</dl>, <dl>
<dd class="ico_name label_volume">VOLUME</dd>
<dt class="ico_data col_volume"></dt>
</dl>, <dl>
<dd class="ico_name label_mktcap">MKT CAP</dd>
<dt class="ico_data col_mktcap"></dt>
</dl>, <dl>
<dd class="ico_name label_lotsize">LOT SIZE</dd>
<dt class="ico_data col_lotsize"></dt>
</dl>, <dl>
<dd class="ico_name label_bid">BID</dd>
<dt class="ico_data col_bid"></dt>
</dl>, <dl>
<dd class="ico_name label_ask">ASK</dd>
<dt class="ico_data col_ask"></dt>
</dl>, <dl>
<dd class="ico_name label_eps">EPS</dd>
<dt class="ico_data col_eps"></dt>
</dl>, <dl>
<dd class="ico_name label_pe">P/E</dd>
<dt class="ico_data col_pe"></dt>
</dl>, <dl>
<dd class="ico_name label_divyield">DIV YIELD</dd>
<dt class="ico_data col_divyield"></dt>
</dl>]
<span class="col_last"></span>
<p class="col_name"></p>

Answer 1

您缺少 _loadFinished(( 方法。

# -*- coding: utf-8 -*-
from PyQt4 import QtCore, QtGui, QtWebKit
from PyQt4.QtGui import *
import bs4 as bs
import sys

class Client(QtWebKit.QWebPage):
    def __init__(self, url):
        self.app = QApplication(sys.argv)
        QtWebKit.QWebPage.__init__(self)
        self.loadFinished.connect(self._loadFinished)
        self.mainFrame().load(QtCore.QUrl(url))
        self.app.exec_()
    def _loadFinished(self, result):
        self.frame = self.mainFrame()
        self.app.quit()

url = 'http://www.hkex.com.hk/Market-Data/Securities-Prices/Equities/Equities-Quote?sym=700&sc_lang=en'
client_response = Client(url)
source = client_response.frame.toHtml()
u =  (unicode(source).encode("utf-8", errors="replace"))
soup = bs.BeautifulSoup(u, 'lxml')
table = soup.find('div', {'class': 'left_list_leve quote'})
price = soup.find('span', {'class': 'col_last'})
name = soup.find('p', {'class': 'col_name'})
all_dls = table.findAll('dl')
for dl in all_dls:
    print (dl)

输出：

<dl>
<dd class="ico_name label_prevcls">PREV. CLOSE*</dd>
<dt class="ico_data col_prevcls">HK$460.000</dt>
</dl>
<dl>
<dd class="ico_name label_open">OPEN**</dd>
<dt class="ico_data col_open">HK$459.000</dt>
</dl>
<dl>
<dd class="ico_name label_turnover">TURNOVER</dd>
<dt class="ico_data col_turnover">HK$11.08B</dt>
</dl>
<dl>
<dd class="ico_name label_volume">VOLUME</dd>
<dt class="ico_data col_volume">24.33M</dt>
</dl>
<dl>
<dd class="ico_name label_mktcap">MKT CAP</dd>
<dt class="ico_data col_mktcap">HK$4,297.37B</dt>
</dl>
<dl>
<dd class="ico_name label_lotsize">LOT SIZE</dd>
<dt class="ico_data col_lotsize">100</dt>
</dl>
<dl>
<dd class="ico_name label_bid">BID</dd>
<dt class="ico_data col_bid">HK$452.400</dt>
</dl>
<dl>
<dd class="ico_name label_ask">ASK</dd>
<dt class="ico_data col_ask">HK$452.600</dt>
</dl>
<dl>
<dd class="ico_name label_eps">EPS</dd>
<dt class="ico_data col_eps">RMB4.383</dt>
</dl>
<dl>
<dd class="ico_name label_pe">P/E</dd>
<dt class="ico_data col_pe">91.55x</dt>
</dl>
<dl>
<dd class="ico_name label_divyield">DIV YIELD</dd>
<dt class="ico_data col_divyield">0.13%</dt>
</dl>

Answer 2

尝试使用硒：

from selenium import webdriver
import time
driver = webdriver.PhantomJS()
driver.get('http://www.hkex.com.hk/Market-Data/Securities-    Prices/Equities/Equities-Quote?sym=700&sc_lang=en')
content = driver.find_element_by_xpath('//*[@class="left_list_item list_item_op"]')
print(content.text)

示例输出：

SIVABALANs-MBP:Desktop siva$ python test_phantomjs.py 
/Users/siva/anaconda3/lib/python3.6/site-packages/selenium/webdriver/phantomjs/webdriver.py:49: UserWarning: Selenium support for PhantomJS has been deprecated, please use headless versions of Chrome or Firefox instead
  warnings.warn('Selenium support for PhantomJS has been deprecated, please use headless '
PREV. CLOSE*
HK$460.000
OPEN**
HK$459.000
TURNOVER
HK$11.08B
VOLUME
24.33M
MKT CAP
HK$4,297.37B
LOT SIZE
100
SIVABALANs-MBP:Desktop siva$