from PySide2.QtCore import Slot, QMetaObjectfrom PySide2.QtCore import Slot, QMetaObject
from PySide2.QtWidgets import QApplication, QComboBox

class MyCombo(QComboBox):

    def __init__(self, *args, **kwargs): 
        super().__init__(*args, **kwargs)
        self.setObjectName('combo') 
        QMetaObject.connectSlotsByName(self)
    
    @Slot(int, name='on_combo_currentIndexChanged') 
    def change_current(self, _):
        print('never')


app = QApplication([])
combo = MyCombo()
combo.show()
combo.addItem('Foo')
app.exec_() 

RecursionError: maximum recursion depth exceeded while calling a Python object