始终在QTextEdit中滚动整行

from PyQt5.QtWidgets import QTextEdit, QApplication, QMainWindow

class MyTextEdit(QTextEdit):
    def __init__(self, parent=None):
        super(MyTextEdit, self).__init__(parent)
        self.setReadOnly(True)  # 设置为只读，防止用户编辑
        self.verticalScrollBar().setSliderPosition(self.verticalScrollBar().maximum())  # 滚动到最底部

    def append(self, text):
        super(MyTextEdit, self).append(text)
        self.verticalScrollBar().setSliderPosition(self.verticalScrollBar().maximum())  # 滚动到最底部

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    mainWindow = QMainWindow()
    textEdit = MyTextEdit(mainWindow)
    mainWindow.setCentralWidget(textEdit)
    mainWindow.show()
    textEdit.append("New line of text")
    sys.exit(app.exec_())