使用pyqt5单击QCalendarWidget on year

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QCalendarWidget
from PyQt5.QtCore import QDate

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Calendar Widget Example")
        
        self.calendar = QCalendarWidget(self)
        self.calendar.setGridVisible(True)
        self.calendar.clicked.connect(self.on_calendar_clicked)
        
        self.setCentralWidget(self.calendar)
        
    def on_calendar_clicked(self, date):
        if date.isValid():
            print("Year clicked:", date.year())
        
if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())