Python PyQt5:在使用QObject和QThread时获取AttributeError

我在开发一个可以同时从不同站点检索包含内容的程序时遇到了一个问题（现在基本上是从两个或多个在线词典检索单词的定义）

我使用QObject和QThread来开发我的程序。起初一切都很顺利，但当我再次尝试搜索和检索另一个单词的内容时，我得到了2个AttributeError

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from gui import Ui_MainWindow
from PyQt5.QtCore import QObject, QThread, pyqtSignal

class Searcher(QObject):
    signalUpdate=pyqtSignal(str, str)

    def __init__(self, dictionary, word):
        super(Searcher, self).__init__()
        self.dictionary=dictionary
        self.word=word
    def run(self):
        self.signalUpdate.emit(self.dictionary, self.word)      

class MyMainWindow(QMainWindow, Ui_MainWindow, QObject):
    signalSearch=pyqtSignal()

    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__()
        self.setupUi(self)
        self.dictList=['Yahoo dictionary', 'Webster dictionary']
        self.searchThreads=[QThread(), QThread()]


    def click(self):
        word=self.lineEdit.text()
        self.searchers=[]

        for dictionary in self.dictList:
            self.searchers.append(Searcher(dictionary, word))

        for index , searcher in enumerate(self.searchers):
            searcher.signalUpdate.connect(self.updateGUI)
            searcher.moveToThread(self.searchThreads[index])
            self.searchThreads[index].start()
            self.signalSearch.connect(searcher.run)

        self.signalSearch.emit()

    def updateGUI(self, dictionary, word):
        print(dictionary+'['+word+']')

if __name__ == "__main__":
    app = QApplication(sys.argv)
    myapp = MyMainWindow()
    myapp.show()

    sys.exit(app.exec_())

我不知道如何处理这个问题。有人知道如何摆脱它吗

Traceback (most recent call last):
Traceback (most recent call last):
File "C:\workspace\online-dictionary\main.py", line 22, in run
File "C:\workspace\online-dictionary\main.py", line 22, in run
self.signalUpdate.emit(self.dictionary, self.word)      
self.signalUpdate.emit(self.dictionary, self.word)      
AttributeError: 'NoneType' object has no attribute 'signalUpdate'
AttributeError: 'NoneType' object has no attribute 'signalUpdate'

---

问题是由于每次搜索完成时都会删除searcher对象列表，这是不必要的

您只需要创建一次searcher对象，然后通过发出带有所需单词的

signalSearch

向它们发出请求

因此searcher类将如下所示：

class Searcher(QObject):
    signalUpdate = pyqtSignal(str, str)

    def __init__(self, dictionary):
        super(Searcher, self).__init__()
        self.dictionary = dictionary

    # word is sent by signalSearch
    def run(self, word):
        self.signalUpdate.emit(self.dictionary, word)

class MyMainWindow(QMainWindow, Ui_MainWindow):
    signalSearch = pyqtSignal(str)

    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__()
        self.setupUi(self)
        self.dictList = ['Yahoo dictionary', 'Webster dictionary']
        self.searchThreads = []
        self.searchers = []
        # create all the threads and searchers once
        for dictionary in self.dictList:
            thread = QThread(self)
            self.searchThreads.append(thread)
            searcher = Searcher(dictionary)
            self.searchers.append(searcher)
            searcher.signalUpdate.connect(self.updateGUI)
            self.signalSearch.connect(searcher.run)
            searcher.moveToThread(thread)
            thread.start()

    def click(self):
        # send a new word to the searchers
        self.signalSearch.emit(self.lineEdit.text())

    def updateGUI(self, dictionary, word):
        print(dictionary+'['+word+']')

主窗口类将如下所示：

class Searcher(QObject):
    signalUpdate = pyqtSignal(str, str)

    def __init__(self, dictionary):
        super(Searcher, self).__init__()
        self.dictionary = dictionary

    # word is sent by signalSearch
    def run(self, word):
        self.signalUpdate.emit(self.dictionary, word)

class MyMainWindow(QMainWindow, Ui_MainWindow):
    signalSearch = pyqtSignal(str)

    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__()
        self.setupUi(self)
        self.dictList = ['Yahoo dictionary', 'Webster dictionary']
        self.searchThreads = []
        self.searchers = []
        # create all the threads and searchers once
        for dictionary in self.dictList:
            thread = QThread(self)
            self.searchThreads.append(thread)
            searcher = Searcher(dictionary)
            self.searchers.append(searcher)
            searcher.signalUpdate.connect(self.updateGUI)
            self.signalSearch.connect(searcher.run)
            searcher.moveToThread(thread)
            thread.start()

    def click(self):
        # send a new word to the searchers
        self.signalSearch.emit(self.lineEdit.text())

    def updateGUI(self, dictionary, word):
        print(dictionary+'['+word+']')

---

你能提供完整的回溯吗？我在帖子上加了回溯。谢谢：）