Python - Me gustaría saber el nombre del widget que parece una lista desplegable accordeon

import sys

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QPushButton, QGroupBox, QGridLayout

class MainWindow(QWidget):

    def __init__(self):

        super().__init__()

        self.setWindowTitle("Menú Acordeón")

        self.setGeometry(100, 100, 400, 300)

        layout = QVBoxLayout()

        self.setLayout(layout)

        group1 = QGroupBox("Shonen")

        group2 = QGroupBox("Seinen")

        group3 = QGroupBox("Shoujo")

        layout_group1 = QVBoxLayout()

        layout_group2 = QVBoxLayout()

        layout_group3 = QVBoxLayout()

        button1 = QPushButton("Naruto")

        button2 = QPushButton("Attack on Titan")

        button3 = QPushButton("Dragon Ball")

        button4 = QPushButton("Tokyo Ghoul")

        button5 = QPushButton("Death Note")

        button6 = QPushButton("Berserk")

        button7 = QPushButton("Sailor Moon")

        button8 = QPushButton("Cardcaptor Sakura")

        button9 = QPushButton("Fruits Basket")

        layout_group1.addWidget(button1)

        layout_group1.addWidget(button2)

        layout_group1.addWidget(button3)

        layout_group2.addWidget(button4)

        layout_group2.addWidget(button5)

        layout_group2.addWidget(button6)

        layout_group3.addWidget(button7)

        layout_group3.addWidget(button8)

        layout_group3.addWidget(button9)

        group1.setLayout(layout_group1)

        group2.setLayout(layout_group2)

        group3.setLayout(layout_group3)

        layout.addWidget(group1)

        layout.addWidget(group2)

        layout.addWidget(group3)

if __name__ == "__main__":

    app = QApplication(sys.argv)

    window = MainWindow()

    window.show()

    sys.exit(app.exec_())