pyqt5 past编辑移过指定行时的删除行

from PyQt5.QtWidgets import QApplication, QMainWindow, QPlainTextEdit
from PyQt5.QtGui import QTextCursor

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

    def initUI(self):
        self.setWindowTitle("Text Editor")
        self.setGeometry(100, 100, 800, 600)

        self.textEdit = QPlainTextEdit(self)
        self.setCentralWidget(self.textEdit)

        # 添加一个按钮，点击时删除指定行
        self.deleteButton = QPushButton("Delete Line", self)
        self.deleteButton.setGeometry(10, 10, 100, 30)
        self.deleteButton.clicked.connect(self.deleteLine)

    def deleteLine(self):
        line_number = 2  # 要删除的行号

        cursor = self.textEdit.textCursor()
        document = self.textEdit.document()

        # 根据行号获取文本块对象
        block = document.findBlockByLineNumber(line_number)

        if block.isValid():
            # 将光标位置设置为要删除的行的开头
            cursor.setPosition(block.position())

            # 将光标位置移动到要删除行的末尾
            cursor.movePosition(QTextCursor.EndOfBlock)

            # 删除选中的文本
            cursor.removeSelectedText()

            # 更新文本编辑器
            self.textEdit.setPlainText(document.toPlainText())

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()