下列代码在调用弹窗MessageBox时出错是怎么回事

Question

from PyQt5.QtWidgets import QApplication,QMainWindow,QMessageBox,QWidget
from main_ui import Ui_MainWindow

class Mainwindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.ui=Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.staticButton.clicked.connect(self.staticFunction())

    def staticFunction(self):
        QMessageBox.about(self.ui,'抱歉','123')



app=QApplication([])
a=Mainwindow()
a.show()
app.exec_()

其中
main_ui是用qtdesigner设计并转换成的.py文件
错误内容：TypeError: about(QWidget, str, str): argument 1 has unexpected type 'Ui_MainWindow'

Answer 1

self.ui并不是一个widget类啊，用self就行了