如何知道两次点击的时间间隔(python和qtdesigner)

from PyQt5.QtCore import QDateTime, QTimer

timer = QTimer()

def handle_click():
    current_time = QDateTime.currentDateTime()
    time_interval = previous_time.secsTo(current_time)
    print("时间间隔：{}秒".format(time_interval))
    previous_time = current_time

button.clicked.connect(handle_click)

timer.start(1000)  # 每隔1秒触发一次计时器事件

from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtCore import QDateTime, QTimer

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("点击时间间隔示例")
        
        self.button = QPushButton("点击我")
        self.setCentralWidget(self.button)
        
        self.timer = QTimer()
        self.timer.timeout.connect(self.handle_click)
        
        self.previous_time = QDateTime.currentDateTime()
        
        self.button.clicked.connect(self.timer.start)
        
    def handle_click(self):
        current_time = QDateTime.currentDateTime()
        time_interval = self.previous_time.secsTo(current_time)
        print("时间间隔：{}秒".format(time_interval))
        self.previous_time = current_time

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()