PyQt5: How to use connectSlotsByName ?

[arbiel]

Hi

I'm looking for designing a way to display various layouts in a window using PyQt5. To do that, I try to define these layouts and the corresponding slots in specific classes to avoid defining all these layouts and slots in a single class
I want to connect signals and slots through the «ConnectSlotsByName» method.
As a test, I wrote this script :

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107

from PyQt5 import QtWidgets from PyQt5.QtCore import QMetaObject, pyqtSlot from PyQt5.QtWidgets import  QMainWindow,  QWidget,   QPushButton from PyQt5.QtWidgets import QHBoxLayout, QVBoxLayout   class A1(QtWidgets.QWidget):     def __init__(auto):         super(A1,auto).__init__()               def init(auto):         zc=QHBoxLayout()         zc.addStretch()         btn=QPushButton("A1")         btn.setObjectName("quit")         zc.addWidget(btn)         zc.addStretch()         vbl=QVBoxLayout(auto)         vbl.addStretch()         vbl.addLayout(zc)         auto.show()         QMetaObject.connectSlotsByName(auto)     @pyqtSlot()     def on_quit_clicked(auto):         print("on_quit_clicked",type(auto))   class A2():     def init(auto,Fenster):         zc=QHBoxLayout()         zc.addStretch()         btn=QPushButton("A2")         btn.setObjectName("quitter")         zc.addWidget(btn)         zc.addStretch()         vbl=QVBoxLayout(Fenster)         vbl.addStretch()         vbl.addLayout(zc)         Fenster.show()         QMetaObject.connectSlotsByName(Fenster)     @pyqtSlot()     def on_quitter_clicked(auto):         print("on_quitter_clicked",type(auto))           class A3_1(QMainWindow):     def __init__(auto):         super(A3_1,auto).__init__()         print("A3_1.__init__",type(auto))     def init(auto):         print("A3_1.init",type(auto))         auto.setGeometry(250,200,800,300)         auto.setWindowTitle('A3') class A3_2(QWidget):     def __init__(auto):         super(A3_2,auto).__init__()         print("A3_2.__init__",type(auto))     def init(auto, Fenster):         zc=QHBoxLayout()         zc.addStretch()         btn=QPushButton("A3_a")         btn.setObjectName("leave")         zc.addWidget(btn)         zc.addStretch()         auto.btn=QPushButton("A3_b")         auto.btn.setObjectName("autoleave")         zc.addWidget(auto.btn)         zc.addStretch()         vbl=QVBoxLayout(auto)         vbl.addStretch()         vbl.addLayout(zc)         Fenster.setCentralWidget(auto)         QMetaObject.connectSlotsByName(Fenster)     @pyqtSlot()     def on_leave_clicked(auto):         print("on_leave_clicked",type(auto))     @pyqtSlot()     def on_autoleave_clicked(auto):         print("on_autoleave_clicked",type(auto))   def mainA1(args):     app = QtWidgets.QApplication(args)     auteur=A1()     auteur.init()     app.exec()     return 0 def mainA2(args):     app = QtWidgets.QApplication(args)     Fenster=QtWidgets.QWidget()     auteur=A2()     auteur.init(Fenster)     Fenster.show()     app.exec()     return 0 def mainA3(args):     app = QtWidgets.QApplication(args)     Fenster=A3_1()     Fenster.init()     print(type(Fenster))     auteur=A3_2()     auteur.init(Fenster)     Fenster.show()     app.exec()     return 0   if __name__ == '__main__':     import sys     sys.exit(mainA1(sys.argv))      #   sys.exit(mainA2(sys.argv)) #   sys.exit(mainA3(sys.argv))

Only in «mainA1» does «connectSlotsByName» really connect the signal with the corresponding slot.

What should I code to have «mainA2» and «mainA3» correctly use «connectSlotsByName» ?