update app icon

Author: xugaoxiang

part8_定时器QTimer的使用/mainwindow.py

@@ -20,7 +20,7 @@ def __init__(self, parent=None):
         super(MainWindow, self).__init__(parent)
         self.setupUi(self)
         icon = QIcon()
-        icon.addPixmap(QPixmap("qt.jpg"))
+        icon.addPixmap(QPixmap("qt.png"))
         self.setWindowIcon(icon)
 
         self.actionExit.triggered.connect(self.onExitTriggered)