效果如下图：
1 """ 2 This example shows an icon 3 in the titlebar of the window. 4 5 """ 6 7 import sys 8 from PyQt5.QtWidgets import QApplication, QWidget 9 from PyQt5.QtGui import QIcon 10 11 12 class Example(QWidget): # The Example class inherits from the QWidget class 13 14 def __init__(self): 15 super().__init__() # The super() method returns the parent object of the Example class 16 17 self.initUI() 18 19 def initUI(self): 20 21 # locates the window on the screen and sets it size 22 self.setGeometry(300, 300, 300, 220) 23 24 # set the title of the window 25 self.setWindowTitle('Hello World') 26 27 # sets the application icon 28 # The QIcon receives the path to our icon 29 self.setWindowIcon(QIcon('web.png')) 30 31 self.show() 32 33 34 if __name__ == '__main__': 35 36 app = QApplication(sys.argv) 37 ex = Example() 38 sys.exit(app.exec_())
问题：如何将标题居中？
