检测是否在QTableWidget中添加或删除了列

from PyQt5.QtWidgets import QApplication, QTableWidget, QTableWidgetItem, QVBoxLayout, QWidget
from PyQt5.QtCore import Qt

class MyTableWidget(QTableWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.previous_column_count = 0

    def resizeEvent(self, event):
        current_column_count = self.columnCount()
        if current_column_count > self.previous_column_count:
            added_columns = current_column_count - self.previous_column_count
            print(f"Added {added_columns} column(s)")
            # 处理添加列的逻辑，如插入新的列、设置列属性等
        elif current_column_count < self.previous_column_count:
            removed_columns = self.previous_column_count - current_column_count
            print(f"Removed {removed_columns} column(s)")
            # 处理删除列的逻辑，如删除指定位置的列
        self.previous_column_count = current_column_count
        super().resizeEvent(event)

if __name__ == '__main__':
    app = QApplication([])
    table_widget = MyTableWidget()
    table_widget.setColumnCount(3)
    table_widget.setRowCount(3)
    table_widget.setHorizontalHeaderLabels(["Column 1", "Column 2", "Column 3"])
    table_widget.setItem(0, 0, QTableWidgetItem("Item 1"))
    table_widget.setItem(0, 1, QTableWidgetItem("Item 2"))
    table_widget.setItem(0, 2, QTableWidgetItem("Item 3"))

    layout = QVBoxLayout()
    layout.addWidget(table_widget)

    widget = QWidget()
    widget.setLayout(layout)
    widget.show()

    app.exec_()