clicked.connect для кнопок, созданных в цикле

# -*- coding: utf-8 -*-
 
from PyQt5 import QtCore, QtWidgets
 
 
class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(500, 520)
        Form.setMinimumSize(QtCore.QSize(285, 350))
        Form.setMaximumSize(QtCore.QSize(285, 350))
 
        for col in range(5):
            for row in range(5):
                self.pb = QtWidgets.QPushButton(Form)
                self.pb.setGeometry(col*55+5, row*55+5, 55, 55)
                self.pb.setText(str(row+1)+str(col+1))
 
        self.l_info = QtWidgets.QLabel(Form)
        self.l_info.setGeometry(QtCore.QRect(10, 290, 40, 40))
        self.l_info.setText("info")
 
        self.pb_start = QtWidgets.QPushButton(Form)
        self.pb_start.setGeometry(150, 290, 100, 50)
        self.pb_start.setText('Start')
 
 
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(500, 520)
        Form.setMinimumSize(QtCore.QSize(285, 350))
        Form.setMaximumSize(QtCore.QSize(285, 350))
        self.last = None
 
        self.l_info = QtWidgets.QLabel(Form)
        self.l_info.setGeometry(QtCore.QRect(10, 290, 40, 40))
        self.l_info.setText("info")
 
        self.btns = []
        idx = 0
        self.last = 0
        for col in range(5):
            for row in range(5):
                pb = QtWidgets.QPushButton(Form)
                pb.setGeometry(col * 55 + 5, row * 55 + 5, 55, 55)
                z = f'{row + 1}{col + 1}'
                pb.setText(z)
                pb.clicked.connect(lambda v, x=z, y=idx: self.foo(x, y))
                self.btns.append(pb)
                idx += 1
 
        self.pb_start = QtWidgets.QPushButton(Form)
        self.pb_start.setGeometry(150, 290, 100, 50)
        self.pb_start.setText('Start')
        self.pb_start.clicked.connect(lambda: self.btns[self.last].setStyleSheet('QPushButton {background-color: red}'))
 
    def foo(self, x, y):
        self.l_info.setText(x)
        self.last = y