1# pip install PyQt5==5.15.2
2from PyQt5.QtWidgets import QApplication,QMainWindow,QLabel
3import sys
4app=QApplication(sys.argv)
5app.setStyle('Fusion')
6app.setApplicationName('PyQt5 App')
7win=QMainWindow()
8label=QLabel()
9label.setText('An App')
10win.setCentralWidget(label)
11win.show()
12sys.exit(app.exec_())