在 qTableView Python PyQt5 中编辑后更新数据框

Question

美好的一天，

我正在尝试将数据框加载到 PyQt5 QTableView 中，以允许使用 ComboBox 编辑最后一列。编辑完成后，打印数据框，以便我可以进一步编辑它。当我单击 'print_data' 时，我无法打印更新后的 QTableView 模型。代码如下。

import sys
from PyQt5.QtWidgets import (QWidget, QLabel, QLineEdit, QTextEdit, QGridLayout, QApplication)
import pandas as pd
import numpy as np
import PyQt5 
from PyQt5.QtWidgets import QVBoxLayout, QPushButton, QGroupBox, QHBoxLayout, QMainWindow, QApplication, QLineEdit, QFileDialog,  QTableWidget,QTableWidgetItem, QTableView, QStyledItemDelegate
from PyQt5 import QtCore, QtGui, QtWidgets   
import os
from PyQt5.QtWidgets import (QWidget, QPushButton, QHBoxLayout, QVBoxLayout, QApplication)
from PyQt5.QtGui import QIcon
import re

def dataframe():
    lst = [['tom', 'reacher', 'True'], ['krish', 'pete', 'True'], 
           ['nick', 'wilson', 'True'], ['juli', 'williams', 'True']] 
    df = pd.DataFrame(lst, columns =['FName', 'LName', 'Student?'], dtype = float) 
    return df

class Delegate(QtWidgets.QItemDelegate):
    def __init__(self, owner, choices):
        super().__init__(owner)
        self.items = choices

    def createEditor(self, parent, option, index):
        self.editor = QtWidgets.QComboBox(parent)
        self.editor.currentIndexChanged.connect(self.commit_editor)
        self.editor.addItems(self.items)
        return self.editor    

    def paint(self, painter, option, index):
        value = index.data(QtCore.Qt.DisplayRole)
        style = QtWidgets.QApplication.style()
        opt = QtWidgets.QStyleOptionComboBox()
        opt.text = str(value)
        opt.rect = option.rect
        style.drawComplexControl(QtWidgets.QStyle.CC_ComboBox, opt, painter)
        QtWidgets.QItemDelegate.paint(self, painter, option, index)

    def commit_editor(self):      ####test
        editor = self.sender()
        self.commitData.emit(editor)


    def setEditorData(self, editor, index):
        value = index.data(QtCore.Qt.DisplayRole)
        num = self.items.index(value)
        editor.setCurrentIndex(num)

    def setModelData(self, editor, model, index):
        value = editor.currentText()
        model.setData(index, value, QtCore.Qt.EditRole)

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)


class PandasModel(QtCore.QAbstractTableModel):
    def __init__(self, data, parent=None):
        QtCore.QAbstractTableModel.__init__(self, parent)
        self._data = data

    def rowCount(self, parent=None):
        return self._data.shape[0]

    def columnCount(self, parent=None):
        return self._data.shape[1]

    def flags(self, index):
        return QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if index.isValid():
            if role == QtCore.Qt.DisplayRole:
                return str(self._data.iloc[index.row(), index.column()])
        return None

    def headerData(self, col, orientation, role):
        if orientation == QtCore.Qt.Horizontal and role == QtCore.Qt.DisplayRole:
            return self._data.columns[col]
        return None

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        self._data[index.row()][index.column()] = value
        self.dataChanged.emit(index, index, (QtCore.Qt.DisplayRole, ))
        return True 

class MyWindow(QWidget):

    def __init__(self):
        super().__init__()
        self.setGeometry(300, 200 ,600, 400)
        self.setWindowTitle('Test')
        self.initUI()


    def show_data(self):
        choices = ['True', 'False']
        self.model = PandasModel(dataframe())
        self.table_data.setModel(self.model)                            
        self.table_data.setItemDelegateForColumn(2, Delegate(self,choices))
        ##make combo boxes editable with a single-click:
        for row in range(5):  
            self.table_data.openPersistentEditor(self.model.index(row, 2))

    def print_data(self):
        print(self.table_data.model()._data)

    def initUI(self):

        welcom = QLabel('Welcome to my app!')

        self.btn_print_data = QPushButton('print data')
        self.btn_print_data.clicked.connect(self.print_data)  ##test

        self.btn_show_table = QPushButton('show data')
        self.btn_show_table.clicked.connect(self.show_data)

        self.table_data = QTableView()
        #self.table_result = QTableView()

        hbox1 = QHBoxLayout()
        hbox1.addWidget(welcom)


        vbox2 = QVBoxLayout()
        vbox2.addWidget(self.btn_show_table)
        vbox2.addWidget(self.btn_print_data) ####test

        vbox3 = QVBoxLayout()
        vbox3.addWidget(self.table_data)
        #vbox3.addWidget(self.table_result)

        hbox2 = QHBoxLayout()
        hbox2.addLayout(vbox2)
        hbox2.addLayout(vbox3)

        vbox1 = QVBoxLayout()
        vbox1.addLayout(hbox1)
        vbox1.addLayout(hbox2)

        self.setLayout(vbox1)
        self.show()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = MyWindow()
    sys.exit(app.exec_())

Answer 1

首先，我不能运行你的代码，所以我改变了：

def setData(self, index, value, role=QtCore.Qt.EditRole):
    self._data[index.row()][index.column()] = value

到

def setData(self, index, value, role=QtCore.Qt.EditRole):
    self._data.iloc[index.row(), index.column()] = value

然后我意识到，每次单击“显示数据”按钮时，都会再次加载原始数据框，因此它会清除所有更改。

    def show_data(self):
        ...
        self.model = PandasModel(dataframe())

所以我在初始化中添加了“self.df = dataframe()”

    def __init__(self):
        ....
        self.df = dataframe()

然后改成show_data

    def show_data(self):
        ...
        self.model = PandasModel(self.df)

我认为这解决了问题，我希望这对你和我一样有帮助，谁来这里寻找 PyQt5 中可编辑 Pandas 表的这种实现

在 qTableView Python PyQt5 中编辑后更新数据框

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