WebScrapping，PyQt的

Question

我一直工作在一個非常簡單的腳本，獲取職稱問題從Python標籤的計算器，並將其顯示在QTextBrowser。

該應用程序按預期工作（至少在開始時），但窗口不顯示，直到它完成加載網頁和刷新按鈕凍結程序，直到它加載太多有沒有辦法解決這個問題？以下是完整的代碼：

#! usr/bin/env python 

from PyQt4.QtGui import * 
import requests 
from bs4 import BeautifulSoup 
import lxml 
from threading import Thread 

class Form(QWidget): 
    def __init__(self, parent=None): 
     super(Form, self).__init__(parent) 

     self.url = "http://www.stackoverflow.com/questions/tagged/python" 

     self.browser = QTextBrowser() 
     self.connectionlabel = QLabel() 

     self.refreshBtn = QPushButton("Refresh") 
     self.refreshBtn.clicked.connect(self.get) 

     layout = QGridLayout() 
     layout.addWidget(self.connectionlabel, 0, 0) 
     layout.addWidget(self.refreshBtn, 0, 1) 
     layout.addWidget(self.browser, 1, 0,1,2) 

     self.setLayout(layout) 
     self.setWindowTitle("StackOverflow: Python") 


    def get(self): 
     self.browser.clear() 
     self.connectionlabel.setText("Connecting.....") 
     try: 
      response = requests.get(self.url) 
      soup = BeautifulSoup(response.content, 'lxml') 

      self.connectionlabel.setText("Connected.") 

      questions = soup.find_all("a", {"class": "question-hyperlink"}) 

      for i, questionTitle in enumerate(questions): 
       try: 
        self.browser.append("\n"+str(i+1)+". "+questionTitle.text) 
       except: 
        pass 

     except: 
      self.connectionlabel.setText("Couldn't connect.") 

if __name__ == '__main__': 
    import sys 
    app = QApplication(sys.argv) 
    screen = Form() 
    screen.show() 
    t = Thread(screen.get) 
    t.deamon = True 
    t.start() 
    sys.exit(app.exec_()) 

Answer 1

UI將一直凍結，直到代碼執行完成。爲了避免使用多處理或線程，並在單獨的進程/線程中調用阻塞代碼。您也可以使用PyQT的QThread。