为什么 QListView 在尝试检索文本时给我一个 NoneType？
Why QListView gives me a NoneType while trying to retrive text?
我正在用 PyQt5 编写一个简单的文件搜索器（完整代码在此处）。
# -*- coding: utf-8 -*-
import sys, os, platform, fnmatch
from PyQt5 import QtCore, QtGui, QtWidgets
sep = os.sep
Ot = platform.system()
file_name = os.path.basename(__file__)
file_path = __file__.replace(file_name, '')
def find(ext, path):
result = []
for root, dirs, files in os.walk(path):
for name in files:
if fnmatch.fnmatch(name, ext):
result.append(os.path.join(root, name))
_ = dirs # For PyLint
return result
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(804, 554)
icon = QtGui.QIcon()
icon.addPixmap(QtGui.QPixmap("C:/Users/Luger/Pictures/ico/search.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
MainWindow.setWindowIcon(icon)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralwidget)
self.horizontalLayout_2.setObjectName("horizontalLayout_2")
self.verticalLayout_2 = QtWidgets.QVBoxLayout()
self.verticalLayout_2.setObjectName("verticalLayout_2")
self.verticalLayout = QtWidgets.QVBoxLayout()
self.verticalLayout.setObjectName("verticalLayout")
self.horizontalLayout = QtWidgets.QHBoxLayout()
self.horizontalLayout.setObjectName("horizontalLayout")
self.folderButton = QtWidgets.QPushButton(self.centralwidget)
font = QtGui.QFont()
font.setPointSize(9)
self.folderButton.setFont(font)
self.folderButton.setObjectName("folderButton")
self.horizontalLayout.addWidget(self.folderButton)
self.extensionLineEdit = QtWidgets.QLineEdit(self.centralwidget)
font = QtGui.QFont()
font.setPointSize(9)
self.extensionLineEdit.setFont(font)
self.extensionLineEdit.setMaxLength(25)
self.extensionLineEdit.setAlignment(QtCore.Qt.AlignCenter)
self.extensionLineEdit.setObjectName("extensionLineEdit")
self.horizontalLayout.addWidget(self.extensionLineEdit)
self.verticalLayout.addLayout(self.horizontalLayout)
self.searchButton = QtWidgets.QPushButton(self.centralwidget)
self.searchButton.setObjectName("searchButton")
self.verticalLayout.addWidget(self.searchButton)
self.verticalLayout_2.addLayout(self.verticalLayout)
self.listView = QtWidgets.QListView(self.centralwidget)
self.listView.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
self.listView.setIconSize(QtCore.QSize(16, 16))
self.listView.setObjectName("listView")
self.entry = QtGui.QStandardItemModel()
self.listView.setModel(self.entry)
self.verticalLayout_2.addWidget(self.listView)
self.horizontalLayout_2.addLayout(self.verticalLayout_2)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 804, 21))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.folderButton.clicked.connect(self.fileChooserFunct)
self.searchButton.clicked.connect(self.searchButtonFunct)
self.listView.clicked[QtCore.QModelIndex].connect(self.on_clicked)
def fileChooserFunct(self):
_translate = QtCore.QCoreApplication.translate
self.dir_to_scan = QtWidgets.QFileDialog.getExistingDirectory(None, 'Select A folder:', f'{file_path[0]}:{sep}', QtWidgets.QFileDialog.ShowDirsOnly)
self.folderButton.setText(_translate("MainWindow", f" Selected: {self.dir_to_scan} "))
self.folderButton.adjustSize()
if Ot == 'Windows': self.dir_to_scan = self.dir_to_scan.replace('/', '\')
def searchButtonFunct(self):
_translate = QtCore.QCoreApplication.translate
self.searchButton.setText(_translate("MainWindow", "Searching, please wait..."))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher - Searching"))
self.searchButton.adjustSize()
self.userExtension = self.extensionLineEdit.text()
result = find(f'*.{self.userExtension}', self.dir_to_scan)
model = QtGui.QStandardItemModel()
self.listView.setModel(model)
for i in result:
item = QtGui.QStandardItem(i)
model.appendRow(item)
self.searchButton.setText(_translate("MainWindow", "Search"))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher"))
self.searchButton.adjustSize()
def on_clicked(self, index):
item = self.entry.itemFromIndex(index)
print(f"itemText='{item.text()}'")
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher"))
self.folderButton.setText(_translate("MainWindow", " Select a folder "))
self.extensionLineEdit.setPlaceholderText(_translate("MainWindow", "Extension of the file"))
self.searchButton.setText(_translate("MainWindow", "Search"))
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
app.setStyle('Fusion')
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
根据用户的回答，我添加了这个 MRE（我希望它是正确的）
self.listView = QtWidgets.QListView(self.centralwidget) #create the widget
self.listView.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers) #paths cannot be modified by the user
self.listView.setObjectName("listView") # Set his name
self.entry = QtGui.QStandardItemModel() #Those two I don't really know what are for
self.listView.setModel(self.entry)
self.listView.clicked[QtCore.QModelIndex].connect(self.on_clicked) #User clicked something in QListView, calling on_clicked
def on_clicked(self, index):
item = self.entry.itemFromIndex(index)
print(f"itemText='{item.text()}'") #Error is given here
我使用了 QtDesigner 并使用 pyuic5.exe 转换了 UI 文件，稍作修改，现在我无法在 QListView 中检索用户选择的对象。
我用了一点S.Nick in this answer的代码。
即使使用他的代码并使用相同的变量名称，当我单击一个对象时我得到 AttributeError: 'NoneType' object has no attribute 'text'（他的代码没有任何问题）。
这里报错
def on_clicked(self, index):
item = self.entry.itemFromIndex(index)
print(f"itemText='{item.text()}'")
我在 2 天前开始搜索解决方案，我查看了大多数 Whosebug 的答案、站点、示例、视频（甚至两个家伙说俄语 1 小时），但我仍然在这里被阻止。
有谁知道如何解决这一问题？谢谢
问题在于，在 searchButtonFunct 方法中，您正在为 QListView 创建一个新模型，以便 QModelIndex 属于该新模型，因此将 self.entry.itemFromIndex() 与不属于该模型的 QModelIndex 一起使用将 return None.
解决方法是使用同一个模型：
def searchButtonFunct(self):
self.entry.clear()
_translate = QtCore.QCoreApplication.translate
self.searchButton.setText(_translate("MainWindow", "Searching, please wait..."))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher - Searching"))
self.searchButton.adjustSize()
self.userExtension = self.extensionLineEdit.text()
result = find(f"*.{self.userExtension}", self.dir_to_scan)
for i in result:
item = QtGui.QStandardItem(i)
self.entry.appendRow(item)
self.searchButton.setText(_translate("MainWindow", "Search"))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher"))
self.searchButton.adjustSize()
我正在用 PyQt5 编写一个简单的文件搜索器（完整代码在此处）。
# -*- coding: utf-8 -*-
import sys, os, platform, fnmatch
from PyQt5 import QtCore, QtGui, QtWidgets
sep = os.sep
Ot = platform.system()
file_name = os.path.basename(__file__)
file_path = __file__.replace(file_name, '')
def find(ext, path):
result = []
for root, dirs, files in os.walk(path):
for name in files:
if fnmatch.fnmatch(name, ext):
result.append(os.path.join(root, name))
_ = dirs # For PyLint
return result
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(804, 554)
icon = QtGui.QIcon()
icon.addPixmap(QtGui.QPixmap("C:/Users/Luger/Pictures/ico/search.ico"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
MainWindow.setWindowIcon(icon)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralwidget)
self.horizontalLayout_2.setObjectName("horizontalLayout_2")
self.verticalLayout_2 = QtWidgets.QVBoxLayout()
self.verticalLayout_2.setObjectName("verticalLayout_2")
self.verticalLayout = QtWidgets.QVBoxLayout()
self.verticalLayout.setObjectName("verticalLayout")
self.horizontalLayout = QtWidgets.QHBoxLayout()
self.horizontalLayout.setObjectName("horizontalLayout")
self.folderButton = QtWidgets.QPushButton(self.centralwidget)
font = QtGui.QFont()
font.setPointSize(9)
self.folderButton.setFont(font)
self.folderButton.setObjectName("folderButton")
self.horizontalLayout.addWidget(self.folderButton)
self.extensionLineEdit = QtWidgets.QLineEdit(self.centralwidget)
font = QtGui.QFont()
font.setPointSize(9)
self.extensionLineEdit.setFont(font)
self.extensionLineEdit.setMaxLength(25)
self.extensionLineEdit.setAlignment(QtCore.Qt.AlignCenter)
self.extensionLineEdit.setObjectName("extensionLineEdit")
self.horizontalLayout.addWidget(self.extensionLineEdit)
self.verticalLayout.addLayout(self.horizontalLayout)
self.searchButton = QtWidgets.QPushButton(self.centralwidget)
self.searchButton.setObjectName("searchButton")
self.verticalLayout.addWidget(self.searchButton)
self.verticalLayout_2.addLayout(self.verticalLayout)
self.listView = QtWidgets.QListView(self.centralwidget)
self.listView.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
self.listView.setIconSize(QtCore.QSize(16, 16))
self.listView.setObjectName("listView")
self.entry = QtGui.QStandardItemModel()
self.listView.setModel(self.entry)
self.verticalLayout_2.addWidget(self.listView)
self.horizontalLayout_2.addLayout(self.verticalLayout_2)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 804, 21))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
self.folderButton.clicked.connect(self.fileChooserFunct)
self.searchButton.clicked.connect(self.searchButtonFunct)
self.listView.clicked[QtCore.QModelIndex].connect(self.on_clicked)
def fileChooserFunct(self):
_translate = QtCore.QCoreApplication.translate
self.dir_to_scan = QtWidgets.QFileDialog.getExistingDirectory(None, 'Select A folder:', f'{file_path[0]}:{sep}', QtWidgets.QFileDialog.ShowDirsOnly)
self.folderButton.setText(_translate("MainWindow", f" Selected: {self.dir_to_scan} "))
self.folderButton.adjustSize()
if Ot == 'Windows': self.dir_to_scan = self.dir_to_scan.replace('/', '\')
def searchButtonFunct(self):
_translate = QtCore.QCoreApplication.translate
self.searchButton.setText(_translate("MainWindow", "Searching, please wait..."))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher - Searching"))
self.searchButton.adjustSize()
self.userExtension = self.extensionLineEdit.text()
result = find(f'*.{self.userExtension}', self.dir_to_scan)
model = QtGui.QStandardItemModel()
self.listView.setModel(model)
for i in result:
item = QtGui.QStandardItem(i)
model.appendRow(item)
self.searchButton.setText(_translate("MainWindow", "Search"))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher"))
self.searchButton.adjustSize()
def on_clicked(self, index):
item = self.entry.itemFromIndex(index)
print(f"itemText='{item.text()}'")
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher"))
self.folderButton.setText(_translate("MainWindow", " Select a folder "))
self.extensionLineEdit.setPlaceholderText(_translate("MainWindow", "Extension of the file"))
self.searchButton.setText(_translate("MainWindow", "Search"))
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
app.setStyle('Fusion')
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
根据用户的回答，我添加了这个 MRE（我希望它是正确的）
self.listView = QtWidgets.QListView(self.centralwidget) #create the widget
self.listView.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers) #paths cannot be modified by the user
self.listView.setObjectName("listView") # Set his name
self.entry = QtGui.QStandardItemModel() #Those two I don't really know what are for
self.listView.setModel(self.entry)
self.listView.clicked[QtCore.QModelIndex].connect(self.on_clicked) #User clicked something in QListView, calling on_clicked
def on_clicked(self, index):
item = self.entry.itemFromIndex(index)
print(f"itemText='{item.text()}'") #Error is given here
我使用了 QtDesigner 并使用 pyuic5.exe 转换了 UI 文件，稍作修改，现在我无法在 QListView 中检索用户选择的对象。
我用了一点S.Nick in this answer的代码。
即使使用他的代码并使用相同的变量名称，当我单击一个对象时我得到 AttributeError: 'NoneType' object has no attribute 'text'（他的代码没有任何问题）。
这里报错
def on_clicked(self, index):
item = self.entry.itemFromIndex(index)
print(f"itemText='{item.text()}'")
我在 2 天前开始搜索解决方案，我查看了大多数 Whosebug 的答案、站点、示例、视频（甚至两个家伙说俄语 1 小时），但我仍然在这里被阻止。
有谁知道如何解决这一问题？谢谢
问题在于，在 searchButtonFunct 方法中，您正在为 QListView 创建一个新模型，以便 QModelIndex 属于该新模型，因此将 self.entry.itemFromIndex() 与不属于该模型的 QModelIndex 一起使用将 return None.
解决方法是使用同一个模型：
def searchButtonFunct(self):
self.entry.clear()
_translate = QtCore.QCoreApplication.translate
self.searchButton.setText(_translate("MainWindow", "Searching, please wait..."))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher - Searching"))
self.searchButton.adjustSize()
self.userExtension = self.extensionLineEdit.text()
result = find(f"*.{self.userExtension}", self.dir_to_scan)
for i in result:
item = QtGui.QStandardItem(i)
self.entry.appendRow(item)
self.searchButton.setText(_translate("MainWindow", "Search"))
MainWindow.setWindowTitle(_translate("MainWindow", "File Searcher"))
self.searchButton.adjustSize()