PyQt5 Hello World

from PyQt5.QtWidgets import (QApplication, QWidget, QLabel, QLineEdit,
                         QPushButton)

class HelloWidget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.setupUi()
        self.button.clicked.connect(self.onClick)

    def setupUi(self):
        self.resize(300, 150)
        self.setWindowTitle("HelloWidget")
        self.label = QLabel(self)
        self.label.setGeometry(10, 10, 90, 20)
        self.label.setText("Введите имя: ")
        self.edit = QLineEdit(self)
        self.edit.setGeometry(100, 10, 90, 20)
        self.button = QPushButton(self)
        self.button.setGeometry(200, 10, 90, 20)
        self.button.setText("Привет!")
        self.result = QLabel(self)
        self.result.setGeometry(10, 40, 190, 20)

    def onClick(self, event):
        name = str(self.edit.text())
        self.result.setText("Привет, %s!" % name)

if __name__ == '__main__':
    a = QApplication([])
    w = HelloWidget()
    w.show()
    a.exec_()