未使用 PyQt5 将数据添加到表中

Question

我的代码应该在单击“添加”按钮时将数据添加到两列表中。问题是当点击“添加”按钮时，只添加了空行。有人可以让我知道出了什么问题吗？下面是将 data1 和 data2 添加到布局右侧的表的部分代码。函数 add_entry 是添加数据的地方。

# Import dependencies
from PyQt5.QtWidgets import (QWidget, QApplication, QTableWidget, QTableWidgetItem,QHBoxLayout, QVBoxLayout, QHeaderView, QPushButton, QDialog,
                            QLabel, QFileDialog, QMainWindow, QAction, QLineEdit)
from PyQt5.Qt import Qt
from PyQt5.QtGui import QPainter
from PyQt5.QtChart import QChart, QChartView, QLineSeries
import sys
import pandas as pd
import math

# ------------------------------------------------------UI-main----------------------------------------------------------------------------------
# Creates a QApplication instance
class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        
        self.items=0

        # Creates table on the left size
        self.table_l = QTableWidget()
        self.table_l.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
        
        # Creates layout object for the right side
        self.layoutRight = QVBoxLayout()
        
        # Creates chart widget
        self.chartView = QChartView()
        # Smooths the edge of the chart
        self.chartView.setRenderHint(QPainter.Antialiasing)

       # Creates table on the right size
        self.table_r = QTableWidget()
        self.table_r.setColumnCount(2)
        # self.table_r.setRowCount()
        self.table_r.setHorizontalHeaderLabels(('Data1', 'Data2'))
        self.table_r.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
        self.table_r.setMaximumSize(600, 300)

        self.lineEditData1 = QLineEdit()
        self.lineEditData2 = QLineEdit()
        
        # Create push buttons
        self.buttonAdd = QPushButton('Add')
        self.buttonClear = QPushButton('Clear')
        self.buttonQuit = QPushButton('Quit')

        self.buttonAdd.setEnabled(False)

        self.layoutRight.setSpacing(10)
        self.layoutRight.addWidget(self.table_r, 50)
        self.layoutRight.addWidget(QLabel('data1'))
        self.layoutRight.addWidget(self.lineEditData1)
        self.layoutRight.addWidget(QLabel('data2'))
        self.layoutRight.addWidget(self.lineEditData2)
        self.layoutRight.addWidget(self.buttonAdd)
        
        self.layout = QHBoxLayout()
        self.layout.addWidget(self.table_l, 50)
        self.setLayout(self.layout)
        self.layout.addLayout(self.layoutRight, 50)
        
        # Connect button to function functions
        self.buttonQuit.clicked.connect(lambda:app.quit())
        self.buttonAdd.clicked.connect(self.add_entry)
        self.buttonClear.clicked.connect(self.reset_table)

        self.lineEditData1.textChanged[str].connect(self.check_disable)
        self.lineEditData2.textChanged[str].connect(self.check_disable)
    
    def add_entry(self):
        Data1 = self.lineEditData1.text()
        Data2 = self.lineEditData2.text()
        
        try:
            Data1Item = QTableWidgetItem(int(Data1))
            Data2Item = QTableWidgetItem(float(Data2))
            Data2Item.setTextAlignment(Qt.AlignRight | Qt.AlignCenter)
            
            self.table_r.insertRow(self.items)
            self.table_r.setItem(self.items, 0, Data1Item)
            self.table_r.setItem(self.items, 1, Data2Item)
            
            self.items +=1

            # after passing the item, clear the field by entering an empty string
            self.lineEditData1.setText('')
            self.lineEditData2.setText('')
        except ValueError:
            pass

# Creates main window object instance
class MainWindow(QMainWindow):
    def __init__(self, widget):
        super().__init__()
        self.setWindowTitle('test')

        self.resize(1200, 1200)

        self.menuBar = self.menuBar()
        self.fileMenu = self.menuBar.addMenu('File')

        # import wind speed data
        importAction = QAction('Open File', self)
        importAction.setShortcut('Ctrl+O')

        # exit action
        exitAction = QAction('Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.triggered.connect(lambda: app.quit())

        self.fileMenu.addAction(importAction)
        self.fileMenu.addAction(exitAction)

        self.setCentralWidget(widget)

if __name__ =='__main__':
    # don't auto scale when drag app to a different monitor
    #QGuiApplication.setHightDpiScaleFactorRoundingPolicy(Qt.HightDpiScaleFactorRoundingPolicy.PassThrough)
    
    app = QApplication(sys.argv)

    w = MyApp()
    demo = MainWindow(w)
    demo.show()
    try:
        sys.exit(app.exec())
    except SystemExit:
        print('Closing window...')

Answer 1

异常的目的不是隐藏错误，而是要知道如何防止它们，因此它们必须尽可能小，以免隐藏其他错误。在这种情况下，QTableWidgetItem 接受字符串作为参数而不是数值，因此会引发异常，阻止执行添加项目的代码。解决方法是使用QTableWidgetItem的setData()方法：

def add_entry(self):
    data1 = self.lineEditData1.text()
    data2 = self.lineEditData2.text()

    try:
        value1 = int(data1)
        value2 = float(data2)
    except ValueError:
        print("failed conversion")
        return
    else:
        data1_item = QTableWidgetItem()
        data1_item.setData(Qt.DisplayRole, value1)
        data2_item = QTableWidgetItem()
        data2_item.setData(Qt.DisplayRole, value2)
        data2_item.setTextAlignment(Qt.AlignRight | Qt.AlignCenter)

        row = self.table_r.rowCount()
        self.table_r.insertRow(row)
        self.table_r.setItem(row, 0, data1_item)
        self.table_r.setItem(row, 1, data2_item)
        self.lineEditData1.clear()
        self.lineEditData2.clear()