如何从PyQt5中显示的excel文件中删除数据并刷新

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QTableWidget, QTableWidgetItem, QPushButton, QVBoxLayout, QWidget
from openpyxl import load_workbook

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.table_widget = QTableWidget()
        self.delete_button = QPushButton("删除选中数据")
        self.delete_button.clicked.connect(self.delete_selected_data)

        layout = QVBoxLayout()
        layout.addWidget(self.table_widget)
        layout.addWidget(self.delete_button)

        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

        self.load_excel_data()

    def load_excel_data(self):
        # 读取Excel文件数据
        workbook = load_workbook("example.xlsx")
        sheet = workbook.active

        # 获取Excel数据的行数和列数
        rows = sheet.max_row
        columns = sheet.max_column

        # 设置QTableWidget的行数和列数
        self.table_widget.setRowCount(rows)
        self.table_widget.setColumnCount(columns)

        # 加载Excel数据到QTableWidget
        for row in range(1, rows+1):
            for col in range(1, columns+1):
                cell_value = sheet.cell(row=row, column=col).value
                item = QTableWidgetItem(str(cell_value))
                self.table_widget.setItem(row-1, col-1, item)

    def delete_selected_data(self):
        selected_items = self.table_widget.selectedItems()

        # 获取选中的行和列
        rows = set()
        columns = set()
        for item in selected_items:
            rows.add(item.row())
            columns.add(item.column())

        # 删除选中的行
        for row in sorted(rows, reverse=True):
            self.table_widget.removeRow(row)

        # 删除选中的列
        for col in sorted(columns, reverse=True):
            self.table_widget.removeColumn(col)

        # 清除所有单元格的内容
        self.table_widget.clearContents()

        # 重新加载Excel数据到QTableWidget
        self.load_excel_data()

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())