PyQt5鼠标操作控制窗体

from PyQt5.Qt import *
import sys

class Window(QWidget):
    def mousePressEvent(self, QMouseEvent):
        if self.isMaximized():
            self.showNormal()
        else:
            self.showMaximized()

app=QApplication(sys.argv)
win=Window()

win.resize(500,500)
win.show()
sys.exit(app.exec_())