錯誤參考selectionChanged

Question

如果我嘗試獲取信號時，我的tableview改變，Python會引發此錯誤：

Traceback (most recent call last): 
    File "UIreadresultwindow.py", line 361, in <module> 
    ui.setupUi(ReadResultWindow) 
    File "UIreadresultwindow.py", line 113, in setupUi 
    self.tableEntity.selectionModel().selectionChanged.connect(self.change 
_display_result) 
AttributeError: 'NoneType' object has no attribute 'selectionChanged' 

我定義tableEntity爲：

self.tableEntity = QtWidgets.QTableView(self.centralWidget) 

編輯：首先我QTableView是空的。我必須打開一個文件來填充它。

EDIT2：具體而言，我有這樣的事情：

from PyQt5 import QtCore, QtGui, QtWidgets 
class Ui_ReadResultWindow(object): 
    def setupUi(self, ReadResultWindow): 
     ReadResultWindow.setObjectName("ReadResultWindow") 
     ReadResultWindow.resize(661, 438) 
     self.centralWidget = QtWidgets.QWidget(ReadResultWindow) 
     self.centralWidget.setObjectName("centralWidget") 
     self.tableEntity = QtWidgets.QTableView(self.centralWidget) 
     self.tableEntity.setObjectName("tableEntity") 
     self.Open = QtWidgets.QPushButton(self.centralWidget) 
     self.Open.setObjectName("Open") 

     self.Open.clicked.connect(self.on_open_file) 
     self.tableEntity.selectionModel().selectionChanged.connect(self.change_display_result) 


    def on_open_file(self): 
     x=[1,2,3,4] 
     self.model= QtGui.QStandardItemModel() 
     for item in x: 
      self.model.invisibleRootItem().appendRow(
       QtGui.QStandardItem(str(x))) 

     self.proxy= QtCore.QSortFilterProxyModel() 
     self.proxy.setSourceModel(self.model) 
     self.tableEntity.setModel(self.proxy) 
     self.tableEntity.resizeColumnsToContents() 

    def change_display_result(self,selected,deselected): 
     index_entity = self.tableEntity.selectionModel().selectedIndexes() 
     temp_entity = self.tableEntity.selectionModel().model() 
     for index in sorted(index_entity): 
      print(str(temp_entity.data(index))) 

if __name__ == "__main__": 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    ReadResultWindow = QtWidgets.QMainWindow() 
    ui = Ui_ReadResultWindow() 
    ui.setupUi(ReadResultWindow) 
    ReadResultWindow.show() 
    sys.exit(app.exec_()) 

Answer 1

爲什麼你得到這個錯誤的原因是你沒有設置模型在嘗試訪問選擇模型之前在表上。解決此問題的最佳方法是將模型設置代碼從on_open_file中移出並移入setupUi。 on_open_file然後只需在重新加載數據之前清除模型。

下面是你的例子的重寫。請注意，我不得不修復其他一些事情才能使其工作（主要是中心小部件和佈局）。

import sys, random 
from PyQt5 import QtCore, QtGui, QtWidgets 

class Ui_ReadResultWindow(object): 
    def setupUi(self, ReadResultWindow): 
     ReadResultWindow.resize(661, 438) 

     self.tableEntity = QtWidgets.QTableView() 

     self.model = QtGui.QStandardItemModel() 
     self.proxy = QtCore.QSortFilterProxyModel() 
     self.proxy.setSourceModel(self.model) 
     self.tableEntity.setModel(self.proxy) 
     self.tableEntity.selectionModel().selectionChanged.connect(
      self.change_display_result) 

     self.Open = QtWidgets.QPushButton('Test') 
     self.Open.clicked.connect(self.on_open_file) 

     widget = QtWidgets.QWidget(ReadResultWindow) 
     layout = QtWidgets.QVBoxLayout(widget) 
     layout.addWidget(self.tableEntity) 
     layout.addWidget(self.Open) 

     ReadResultWindow.setCentralWidget(widget) 

    def on_open_file(self): 
     self.model.setRowCount(0) 
     x = random.sample(range(10, 100), 10) 
     for item in x: 
      self.model.invisibleRootItem().appendRow(
       QtGui.QStandardItem(str(item))) 
     self.tableEntity.resizeColumnsToContents() 

    def change_display_result(self,selected,deselected): 
     index_entity = self.tableEntity.selectionModel().selectedIndexes() 
     temp_entity = self.tableEntity.selectionModel().model() 
     for index in sorted(index_entity): 
      print(str(temp_entity.data(index))) 

if __name__ == "__main__": 

    app = QtWidgets.QApplication(sys.argv) 
    ReadResultWindow = QtWidgets.QMainWindow() 
    ui = Ui_ReadResultWindow() 
    ui.setupUi(ReadResultWindow) 
    ReadResultWindow.show() 
    sys.exit(app.exec_()) 

Answer 2

您必須先設置模式。所以，你可以做這樣的事情：

self.tableEntity = QtWidgets.QTableView(self.centralWidget) 
self.tableEntity.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection) 

你可以把這個模式之一：{ NoSelection, SingleSelection, MultiSelection, ExtendedSelection, ContiguousSelection }

希望這有助於