pyqt/MyApp.py

# Only needed for access to command line arguments
import sys

from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel


# 自定义窗口，继承 QMainWindow
class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.setWindowTitle("My Awesome App")  # 标题

        label = QLabel("THIS IS AWESOME!!!")
        label.setAlignment(Qt.AlignCenter)

        self.setCentralWidget(label)


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = MainWindow()
    window.show()  # 默认下 windows 是隐藏的
    # 开启事件循环
    app.exec_()