python - 名称错误 : name 'QWebPage' is not defined

Question

我是 Python 新手，我试图理解为什么会出现以下错误:

Traceback (most recent call last):
File "WebScraper.py", line 10, in <module>
    class Render(QWebPage):  
NameError: name 'QWebPage' is not defined

这是代码:

import sys  
from PyQt5.QtGui import *  
from PyQt5.QtCore import *  
from PyQt5.QtWebEngineWidgets import *  
from lxml import html 

#Take this class for granted.Just use result of rendering.
class Render(QWebPage):  
  def __init__(self, url):  
    self.app = QApplication(sys.argv)  
    QWebPage.__init__(self)  
    self.loadFinished.connect(self._loadFinished)  
    self.mainFrame().load(QUrl(url))  
    self.app.exec_()  

  def _loadFinished(self, result):  
    self.frame = self.mainFrame()  
    self.app.quit()  

url = 'http://pycoders.com/archive/'  
r = Render(url)  
result = r.frame.toHtml()
#This step is important.Converting QString to Ascii for lxml to process
archive_links = html.fromstring(str(result.toAscii()))
print(archive_links)

我知道 __init__ 充当构造函数，但为什么它不将其设置为 self？所以我需要将其更改为类似 QWebPage.x = self？

Answer 1

您没有导入QWebPage

尝试将此导入添加到脚本顶部:

from PyQt5.QtWebKitWidgets import QWebPage