This code is just an example using Google site, but I want it work for any JavaScript-enabled sites. So, I have: QPushButton object which is connected to getAnswer function which take text entered to QLineEdit object and (should) pass it to QThread, where this text should be used in search(text) function. Afterwards resulting text should appear in QLabel object. The question is: how do I pass this string to QThread and resulting string out? The code below is expectedly crashed on
Qt Code: 
  1. self.get_thread = getGoogle(self.text)
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which is wrong.
Qt Code: 
  1. #!/usr/bin/python3
  2. # -*- coding: utf-8 -*-
  3.  
  4. import sys
  5. from bs4 import BeautifulSoup
  6. from PyQt5.QtWidgets import QApplication, QWidget, \
  8. from PyQt5.QtCore import pyqtSignal, QEventLoop, QThread
  9. from PyQt5.QtWebEngineWidgets import QWebEngineView
  10. from requests import get
  11.  
  12.  
  13. class getGoogle(QThread):
  14.     def __init__(self):
  15.         QThread.__init__(self)
  16.         self.text=text
  17.  
  18.     def __del__(self):
  19.         self.wait()
  20.  
  21.     def render(source_html):
  22.         class Render(QWebEngineView):
  23.             def __init__(self, html):
  24.                 self.html = None
  25.                 self.app = QApplication([])
  26.                 QWebEngineView.__init__(self)
  27.                 self.loadFinished.connect(self._loadFinished)
  28.                 self.setHtml(html)
  29.                 while self.html is None:
  30.                     self.app.processEvents(QEventLoop.ExcludeUserInputEvents | QEventLoop.ExcludeSocketNotifiers | QEventLoop.WaitForMoreEvents)
  31.                 self.app.quit()
  32.  
  33.             def _callable(self, data):
  34.                 self.html = data
  35.  
  36.             def _loadFinished(self):
  37.                 self.page().toHtml(self._callable)
  38.  
  39.         return Render(source_html).html
  40.  
  41.     def search(self, text):
  42.         query=str(text)
  43.         query = query.replace(" ", "+")
  44.         url='https://www.google.com/search?q=' + query
  45.         headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36'}
  46.         sample_html = get(url, headers=headers).text
  47.         soup = BeautifulSoup(self.render(sample_html), "html.parser")
  48.         res = soup.find('span', attrs={'class': 'cwcot'})
  49.         res = res.get_text()
  50.         return res
  51.  
  52.     def run(self):
  53.         result=self.search(text)
  54.         self.emit(pyqtSignal('add_answer(QString)'), result)
  55.         self.sleep(2)
  56.  
  57.  
  58. class MyApp(QWidget):
  59.     def __init__(self):
  60.         super().__init__()
  61.         self.initUI()
  62.  
  63.     def initUI(self):
  64.         self.sendButton = QPushButton('Ask', self)
  65.         self.questionEdit = QLineEdit(self)
  66.         self.answer=QLabel(self)
  67.         grid = QGridLayout(self)
  68.         grid.setSpacing(10)
  69.         grid.addWidget(self.questionEdit, 1, 0)
  70.         grid.addWidget(self.sendButton, 1, 1)
  71.         grid.addWidget(self.answer, 2,0)
  72.         self.sendButton.clicked.connect(self.getAnswer)
  73.         self.setLayout(grid)
  74.         self.resize(500, 100)
  75.         self.show()
  76.  
  77.     def getAnswer(self):
  78.         text = self.questionEdit.text()
  79.         if len(text)>=1:
  80.             self.get_thread = getGoogle(self.text)
  81.             self.connect(self.get_thread, pyqtSignal("add_answer(QString)"), self.answer.setText)
  82.             self.get_thread.start()
  83.         else:
  84.             self.answer.setText("Specify your question")
  85.  
  86. if __name__ == '__main__':
  87.     app = QApplication(sys.argv)
  88.     my = MyApp()
  89.     sys.exit(app.exec_())
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I was told, that two QApplication can not be run simultaneously. Then what the better solution: QThread, QProcess (again, how to transfer string values between the processes)? Maybe there are other options to render resulting html-code, without QWebEngineView? Any suggestions would help. Thanks.