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Update hello_world.md

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@ -344,7 +344,7 @@ from PyQt5.QtCore import QCoreApplication
qbtn = QPushButton('Quit', self)
```
创建一个继承自`QPushButton`的按钮。第一个参数是按钮的文本，第二个参数是按钮的父级组件，这个例子中，父级组件就是我们创建的继承自`Qwidget`的`Example`类。
创建一个继承自`QPushButton`的按钮。第一个参数是按钮的文本，第二个参数是按钮的父级组件，这个例子中，父级组件就是我们创建的继承自`QWidget`的`Example`类。
```text
qbtn.clicked.connect(QCoreApplication.instance().quit)