Programmaticaly create and connect QSlider

Question

I want to programmaticaly create sliders and connect them to simple slot with the following :

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QMainWindow, QApplication, QVBoxLayout, QSlider, QWidget

        
class VuePyQt(QMainWindow):
    def __init__(self, parent = None):
        super(VuePyQt, self).__init__()

        self.params = ["a", "b"]
        
        layout = QVBoxLayout()        

        for pname in self.params:
            # create new slider
            slider = QSlider(Qt.Horizontal)
            # connect signal to a simply slot that depends on "key"
            slider.valueChanged.connect(lambda : print(pname))
            # add slider to layout
            layout.addWidget(slider)
            # add reference 
            setattr(self, pname+"_slider", slider)

        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)


def main():
    app = QApplication(sys.argv)
    vue = VuePyQt()
    vue.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()        

This create a window with 2 sliders, one for each parameters, a and b.

What I expect

Moving the first slider prints "a", and moving the second slider prints "b"

What I get

Moving any slider prints "b"

What I tried

Adding more parameters or changing the order shows that it is always the last parameter that was set that is printed for all sliders.