WARNING: QApplication was not created in the main() thread

from django.http import HttpResponse
 
def index(request):
    return HttpResponse("Hello METANIT.COM")
 
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QUrl
from PyQt5.QtWebEngineWidgets import QWebEnginePage
import bs4 as bs
import urllib.request
import time
import re
import sys
import requests
 
regex = r"price_85d2b9c\s+\w+\D+(?P<price>\d+\s+\d+)"
 
class Client(QWebEnginePage):
    def __init__(self,url):
        global app
        self.app = QApplication(sys.argv)
        QWebEnginePage.__init__(self)
        self.html = ""
        self.loadFinished.connect(self.on_load_finished)
        self.load(QUrl(url))
       # time.sleep(20)
        self.app.exec_()
 
    def on_load_finished(self):
        self.html = self.toHtml(self.Callable)
        print("Load Finished")
 
    def Callable(self,data):
        self.html = data
        self.app.quit()
 
url = "https://www.aviasales.ru/search/PEE2911MOW23121?request_source=search_form&expected_price_currency=rub&expected_price_source=calendar"
r = requests.get(url)
r.cookies
headers = {'user-agent': 'my-app/0.0.1'}
client_response = Client(url)
window = MainWindow()
print(client_response.html)
with open("test.html", "w", encoding="utf-8") as f:
    f.write(client_response.html)
 
test_str = client_response.html
 
matches = re.finditer(regex, test_str, re.MULTILINE)
 
for matchNum, match in enumerate(matches, start=1):
    
    print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
    
    for groupNum in range(0, len(match.groups())):
        groupNum = groupNum + 1
        
        print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))