网页抓取，PyQt

Question

我一直在研究一个非常简单的脚本，它从 Whosebug 中的 python 标签获取问题标题，并在 QTextBrowser 中显示它们。

应用程序按预期工作（至少在开始时是这样）但是 Window 直到它完成加载网页才显示并且刷新按钮冻结程序直到它也加载有没有办法解决这个问题？这是完整的代码：

#! 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.whosebug.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("Whosebug: 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 将一直冻结，直到代码执行完成。为了避免这种情况，请使用多处理或线程并在单独的 process/thread 中调用阻塞代码。你也可以使用 PyQT 的 QThread.

网页抓取，PyQt

WebScraping, PyQt

python

pyqt

beautifulsoup