Passing input value to a lambda function to trigger a signal

Question

I am creating a number of widgets inside a layout, and every widget is passing a signal (current number rows). But, suerprisingly, the output is not a number (row_count), but False?

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys

class main(QWidget):
    def __init__(self):
        super().__init__()
        
        top_layout = QFormLayout()
        self.setLayout(top_layout)
        
        test = QToolButton()
        test.setText('W_1')
        top_layout.addRow(test)
        test.clicked.connect(lambda val=top_layout.rowCount(): self.delNewPar(val))

        test2 = QToolButton()
        test2.setText('W_2')
        top_layout.addRow(test2)
        test2.clicked.connect(lambda val=top_layout.rowCount(): self.delNewPar(val))

        test3 = QToolButton()
        test3.setText('W_3')
        top_layout.addRow(test3)
        test3.clicked.connect(lambda val=top_layout.rowCount(): self.delNewPar(val))
        
    @pyqtSlot(int)
    def delNewPar(self, val):
        print(val)        
   
if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = main()
    widget.show()
    sys.exit(app.exec_())      

The output when click different buttons is:

False
False
False
False
False
False

What am I missing in this procedure ?

This is a working example (same logic I am following:)

from PyQt5.QtWidgets import (
    QApplication, QMainWindow, QAction, QPushButton,
    QWidget, QLabel, QVBoxLayout, QHBoxLayout
)
import sys

class Window(QWidget):

    def __init__(self):
        super().__init__()

        v = QVBoxLayout()
        h = QHBoxLayout()

        for a in range(10):
            button = QPushButton(str(a))
            button.pressed.connect(
                lambda val=a: self.button_pressed(val)
            )                   # pass the value in as a (re-)named parameter.
            h.addWidget(button)

        v.addLayout(h)
        self.label = QLabel("")
        v.addWidget(self.label)
        self.setLayout(v)

    def button_pressed(self, n):
        self.label.setText(str(n))


app = QApplication(sys.argv)
w = Window()
w.show()
app.exec_()

I am using the same logic, but my output is different !?