如何判断是否按下了两个QPushButtons (Python)

from PyQt5.QtWidgets import QPushButton

button1 = QPushButton("Button 1")
button2 = QPushButton("Button 2")

def button_clicked():
    sender = self.sender()
    if sender == button1:
        print("Button 1 was clicked.")
    elif sender == button2:
        print("Button 2 was clicked.")

button1.clicked.connect(button_clicked)
button2.clicked.connect(button_clicked)

layout.addWidget(button1)
layout.addWidget(button2)

app.exec_()