Call objects from a list which reproduces object names

I'm creating an application which has many checkBoxes. Every 4 checkBoxes are inside of a groupBox_n (n=36) and these groupBoxes are then inside of another groupBox.

Each checkBox is named following a certain rule which is very convenient for me. I want to have access to each of them, but I don't want to type their name every time. So I though about reproducing their names in a list, so that I could iterate over the list and have control, depending on their names.

But when I try to connect a button calling a string from my list, I'm not able to do that. Here I reproduced an example with a QLineEdit.

Is it possible to do something like that?

Calling findChildrendoes not help me, because then I don't know what is the position of my checkBox in my application, or "who is who" there. Calling by ObjectName is also not possible, is it?

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(400, 300)
        self.gridLayout = QtGui.QGridLayout(Form)
        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))

        self.My_lineEdit = QtGui.QLineEdit(Form)
        self.My_lineEdit.setObjectName(_fromUtf8("My_lineEdit"))

        self.gridLayout.addWidget(self.lineEdit, 0, 1, 1, 1)
        self.pushButton = QtGui.QPushButton(Form)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.gridLayout.addWidget(self.pushButton, 0, 0, 1, 1)

        self.retranslateUi(Form)

        MyStrinng = 'My_lineEdit'
        QtCore.QObject.connect(self.pushButton, QtCore.SIGNAL(_fromUtf8("clicked()")), self.Mystring.clear)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        Form.setWindowTitle(_translate("Form", "Form", None))
        self.pushButton.setText(_translate("Form", "PushButton", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Form = QtGui.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

Like this, PyQt does not recognize my string as the object's name. I also tried to make a PyQt string with QCore.QString('My_lineEdit'), but QString is not available for my version (you can see here)