class Main(QtWidgets.QWidget, Ui_Form):

        x = ''

        def __init__(self, parent=None):
            super(Main, self).__init__(parent)
            self.setupUi(self)
            self.pushButton.clicked.connect(self.subproce)
            self.checkBox.stateChanged.connect(
            lambda state=self.checkBox.isChecked(), no=1: self.selectBooks(state, no))

        def selectBooks(self, toggle, no):
            if toggle == QtCore.Qt.Checked:
                print(''.format(toggle, no))
                if no == 1:
                    print(''.format(no))
                    self.x = self.lineEdit_3.text()
            else:
                print(''.format(toggle, no))
                self.x = self.lineEdit_3.text()

        def subproce(self):
            x1 = self.x
            file = str(self.lineEdit.text()) + '/' + str(self.lineEdit_2)
            file_by = str(x1) + self.lineEdit_4.text()
            subprocess.call('pyuic5' + self.file + '-x' + self.file_by)