[closed] "checked" variable (attribute?) origin?

[paul18fr]

Hi

I've found this small snippet, and in the the_button_was_toggled method, i do not understand from where the checked variable (attribute?) come from? Is it an inheritance?

Thanks

import sys

from PySide6.QtWidgets import (QApplication,
                               QMainWindow,
                               QPushButton,
                              )


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("My App")

        button = QPushButton("Press Me!")
        button.setCheckable(True)
        button.clicked.connect(self.the_button_was_clicked)
        button.clicked.connect(self.the_button_was_toggled)

        # Set the central widget of the Window.
        self.setCentralWidget(button)

    def the_button_was_clicked(self):
        print("Clicked!")

    def the_button_was_toggled(self, checked):
        print("Checked?", checked)


app = QApplication(sys.argv)

window = MainWindow()
window.show()

app.exec()