检索动态网页内容PyQt5

Question

在能够登录到一个受保护的网站后，我想刮掉动态加载的相同网页的一些内容。这个代码块可以正确地处理身份验证，但是如果我尝试访问类名为lang-py的前标记元素，我会得到None作为输出返回给我。

import sys

from PyQt5.QtCore import QByteArray, QUrl
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineCore import QWebEngineHttpRequest
from PyQt5.QtWebEngineWidgets import QWebEnginePage


class Render(QWebEnginePage):
    def __init__(self, url):
        app = QApplication(sys.argv)
        QWebEnginePage.__init__(self)
        self.loadFinished.connect(self._loadFinished)

        self._html = ""

        username = "username"
        password = "password"
        base64string = QByteArray(("%s:%s" % (username, password)).encode()).toBase64()
        request = QWebEngineHttpRequest(QUrl.fromUserInput(url))
        equest.setHeader(b"Authorization", b"Basic: %s" % (base64string,))

        self.load(request)

        app.exec_()

    @property
    def html(self):
        return self._html

    def _loadFinished(self):
        self.toHtml(self.handle_to_html)

    def handle_to_html(self, html):
        self._html = html
        QApplication.quit()


def main():
    url = "https://stackoverflow.com/questions/64055445/scraping-websites-with-protected-content-using-pyqt5/64055601?noredirect=1#comment113272437_64055601"
    r = Render(url)
    print(r.html)


if __name__ == "__main__":
    main()

如何在<pre>中加载内容？

Answer 1

带有标记"pre“和类"lang-py”的元素出现在html中，因此您可以使用BeautifulSoup来获取数据：

# ...
from bs4 import BeautifulSoup

# ...

def main():
    url = "https://stackoverflow.com/questions/64055445/scraping-websites-with-protected-content-using-pyqt5/64055601?noredirect=1#comment113272437_64055601"
    r = Render(url)
    soup = BeautifulSoup(r.html, "html.parser")
    for tag in soup.find_all("pre", {"class": "lang-py"}):
        print("=" * 50)
        print(tag.text)