從Windows cmd或IDLE運行而不是從PyCharm運行時，「QThread：線程仍在運行時被銷燬」？

Question

這是使用QObject.moveToThread實現PyQt多線程的程序的簡化版本。基本上，我在單獨的線程上查詢網頁並提取HMTL內容。

我得到這個問題，從IDLE或Windows命令行運行代碼掛起蟒蛇。 Windows cmd顯示「QThread：線程仍在運行時銷燬」。但是，如果我從Pycharm運行它，一切正常。

你可以得到的.ui文件here

任何想法？

import requests 
import sys 
from PyQt4 import QtGui, uic 
from PyQt4.QtCore import QObject, pyqtSlot, pyqtSignal, QThread 


qtCreatorFile = "window.ui" 
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile) 


class HttpClient(QObject): 

    finished = pyqtSignal(str) 

    def __init__(self): 
     QObject.__init__(self) 

    @pyqtSlot() 
    def retrieve_page(self, url): 
     response = requests.get(url) 
     self.finished.emit(response.text) 


class HtmlGetter(QtGui.QMainWindow, Ui_MainWindow): 

    def __init__(self): 
     QtGui.QMainWindow.__init__(self) 
     Ui_MainWindow.__init__(self) 
     self.setupUi(self)  
     self.go_button.clicked.connect(self.query_page) 

    def query_page(self): 
     http_client = HttpClient() 
     temp_thread = QThread() 
     http_client.moveToThread(temp_thread) 

     temp_thread.started.connect(
     lambda: http_client.retrieve_page("http://www.google.com/")) 
     http_client.finished.connect(self.show_html) 

     # Terminating thread gracefully. 
     http_client.finished.connect(temp_thread.quit) 
     http_client.finished.connect(http_client.deleteLater) 
     temp_thread.finished.connect(temp_thread.deleteLater) 

     temp_thread.start() 

    def show_html(self, html_text): 
     print(html_text) 


def main(): 
    app = QtGui.QApplication(sys.argv) 
    window = HtmlGetter() 
    window.show() 
    sys.exit(app.exec_()) 


if __name__ == '__main__': 
    main() 

Answer 1

我想通了：

兩個http_client和temp_thread必須的屬性或HtmlGetter類。我認爲這是因爲python會在退出函數時丟棄它們。這是工作代碼：

import requests 
import sys 
from PyQt4 import QtGui, uic 
from PyQt4.QtCore import QObject, pyqtSlot, pyqtSignal, QThread 


qtCreatorFile = "window.ui" 
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile) 


class HttpClient(QObject): 

    finished = pyqtSignal() 
    send_text = pyqtSignal(str) 

    def __init__(self): 
     QObject.__init__(self) 

    @pyqtSlot() 
    def retrieve_page(self, url): 
     response = requests.get(url) 
     self.send_text.emit(response.text) 
     self.finished.emit() 


class HtmlGetter(QtGui.QMainWindow, Ui_MainWindow): 

    def __init__(self): 
     QtGui.QMainWindow.__init__(self) 
     Ui_MainWindow.__init__(self) 
     self.setupUi(self)  
     self.go_button.clicked.connect(self.query_page) 

    def query_page(self): 
     self.http_client = HttpClient() 
     self.temp_thread = QThread() 
     self.http_client.moveToThread(self.temp_thread) 

     self.temp_thread.started.connect(
     lambda: self.http_client.retrieve_page("http://www.google.com/")) 
     self.http_client.send_text.connect(self.show_html) 

     # Terminating thread gracefully. 
     self.http_client.finished.connect(self.temp_thread.quit) 
     self.http_client.finished.connect(self.http_client.deleteLater) 
     self.temp_thread.finished.connect(self.temp_thread.deleteLater) 

     self.temp_thread.start() 

    def show_html(self, html_text): 
     print(html_text) 


def main(): 
    app = QtGui.QApplication(sys.argv) 
    window = HtmlGetter() 
    window.show() 
    sys.exit(app.exec_()) 


if __name__ == '__main__': 
    main()