PEP 614错误必须在QWidget之前构造QApplication

Question

我在PyQt5和PySide2中测试了PEP 614，但收到消息：

QWidget：必须在QWidget之前构造一个QApplication

运行此消息后，尝试在python中为Qt使用灵活的装饰器

import random
import sys

from PyQt5.QtWidgets import (QApplication, QLabel, QPushButton, QVBoxLayout, QWidget)
from PyQt5.QtCore import (Qt)


class MyWidget(QWidget):
    button = QPushButton('buttons')
    def __init__(self):
        super().__init__()

        self.hello = ["Hallo Welt", "Hei maailma", "Hola Mundo", "Привет мир"]

        self.text = QLabel("Hello World")
        self.text.setAlignment(Qt.AlignCenter)

        self.layout = QVBoxLayout()
        self.layout.addWidget(self.text)
        self.setLayout(self.layout)

    @button.clicked.connect
    def magic(self):
        self.text.setText(random.choice(self.hello))

if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = MyWidget()
    widget.resize(800, 600)
    widget.show()
    sys.exit(app.exec_())