sigma_in.py

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(237, 118)
        self.gridLayout_2 = QtWidgets.QGridLayout(Dialog)
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.gridLayout = QtWidgets.QGridLayout()
        self.gridLayout.setObjectName("gridLayout")
        self.buttonBox = QtWidgets.QDialogButtonBox(Dialog)
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName("buttonBox")
        self.gridLayout.addWidget(self.buttonBox, 1, 0, 1, 1)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(Dialog)
        font = QtGui.QFont()
        font.setFamily("Century Gothic")
        font.setPointSize(12)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setLayoutDirection(QtCore.Qt.LeftToRight)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.doubleSpinBox = QtWidgets.QDoubleSpinBox(Dialog)
        font = QtGui.QFont()
        font.setFamily("Century Gothic")
        font.setPointSize(12)
        font.setBold(True)
        font.setWeight(75)
        self.doubleSpinBox.setFont(font)
        self.doubleSpinBox.setDecimals(3)
        self.doubleSpinBox.setMinimum(0.0)
        self.doubleSpinBox.setMaximum(100.0)
        self.doubleSpinBox.setObjectName("doubleSpinBox")
        self.horizontalLayout.addWidget(self.doubleSpinBox)
        self.gridLayout.addLayout(self.horizontalLayout, 0, 0, 1, 1)
        self.gridLayout_2.addLayout(self.gridLayout, 0, 0, 1, 1)

        self.retranslateUi(Dialog)
        self.buttonBox.accepted.connect(Dialog.accept)
        self.buttonBox.rejected.connect(Dialog.reject)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Sigma Value"))
        self.label.setText(_translate("Dialog", "Sigma"))

        ############ Added
    def onOk(self):
        sigma = str(self.doubleSpinBox.text())
#        print('-------------')
        return float(sigma)
        ############