TypeError:修饰的插槽没有与doubleClicked(QModelIndex)兼容的信号

Question

我正在处理一个项目，我错误地删除了它。所以当我重写它的时候，我发现了一个问题。

我有一个QDialog，它显示了带有(QTreeView(的目录视图，当我试图从QMainWindow(父类(启动它时，它失败了。

这就是记住的代码：

# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'Dialog.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!
import pandas as pd
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import (QFileSystemModel, QDialog)
class Ui_Dialog(QDialog):
def __init__(self, tableWidget, statusbar):
super(Ui_Dialog, self).__init__()
self.setupUi(self)
self.qtRectangle = self.frameGeometry()
self.centerPoint = QtWidgets.QDesktopWidget().availableGeometry().center()
self.qtRectangle.moveCenter(self.centerPoint)
self.move(self.qtRectangle.topLeft())
self.tableWidget = tableWidget
self.statusbar = statusbar
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(500 , 500)
self.horizontalLayout_2 = QtWidgets.QHBoxLayout(Dialog)
self.horizontalLayout_2.setObjectName("horizontalLayout_2")
self.treeView = QtWidgets.QTreeView(Dialog)
self.model = QFileSystemModel()
self.model.setRootPath("")
self.treeView.setModel(self.model)
self.treeView.setObjectName("treeView")
self.horizontalLayout_2.addWidget(self.treeView)
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
self.treeView.doubleClicked.connect(self.import_data)
@QtCore.pyqtSlot("QModelIndex", "QModelIndex")
def import_data(self, signal):
filePath = self.model.filePath(signal)
df = pd.read_csv(filePath)
self.tableWidget.setColumnCount(len(df.columns))
self.tableWidget.setRowCount(len(df.index))
for index in range(len(df.index)):
for col in range(len(df.columns)):
self.tableWidget.setHorizontalHeaderLabels(df.columns)
self.tableWidget.setItem(
index,
col,
QtWidgets.QTableWidgetItem(df.iat[index, col]))
self.tableWidget.resizeRowsToContents()
self.tableWidget.resizeColumnsToContents()
self.tableWidget.setSortingEnabled(True)
self.statusbar.showMessage("Data uploaded", 1200)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))

当我运行它时，它会引发一个TypeError:

PS C:UserspcDesktopDV_GUIpy files> & python 
"c:/Users/pc/Desktop/DV_GUI/py files/MainWindow.py"
Traceback (most recent call last):
File "c:/Users/pc/Desktop/DV_GUI/py files/MainWindow.py", line 127, in show_dir
sys_file = Ui_Dialog(self.tableWidget, self.statusbar)
File "c:UserspcDesktopDV_GUIpy filesDialog.py", line 18, in __init__
self.setupUi(self)
File "c:UserspcDesktopDV_GUIpy filesDialog.py", line 42, in setupUi
self.treeView.doubleClicked.connect(self.import_data)
TypeError: decorated slot has no signature compatible with doubleClicked(QModelIndex)

这是启动QDialog:的代码

self.actionOpen.triggered.connect(self.show_dir)
def show_dir(self):
sys_file = Ui_Dialog(self.tableWidget, self.statusbar)
sys_file.exec_() 

我记得我写的代码，但似乎有什么东西从我的脑海中溜走了。

Answer 1

如果您查看文档，问题在于您使用的签名：

void QAbstractItemView:：doubleClicked(const QModelIndex&index(

双击鼠标按钮时会发出此信号。项目鼠标被双击是由索引指定的。信号是仅在索引有效时发出。

很明显，信号只携带一个QModelIndex，但您指出它们是2，因此解决方案是更改为：

@QtCore.pyqtSlot("QModelIndex")
def import_data(self, signal):
# ...

或者：

@QtCore.pyqtSlot(QtCore.QModelIndex)
def import_data(self, signal):
# ...

---

如果在您的初始代码工作之前，您使用的PyQt版本可能有一个在当前版本中已被删除的错误。