Converter

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore

class Converter(QtGui.QWidget):

    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        self.setWindowTitle('Unit_Converter')
        self.setWindowIcon(QtGui.QIcon(r'C:\Program Files (x86)\RocketDock\Icons\WP7 icons\WP7 icons\Tasks.png'))

        Number = QtGui.QLabel('Number: ')
        Number.setFont(QtGui.QFont('', 11))

        Unit = QtGui.QLabel('Unit: ')
        Unit.setFont(QtGui.QFont('', 11))

        Convert_Unit = QtGui.QLabel('Convert Unit: ')
        Convert_Unit.setFont(QtGui.QFont('', 11))

        self.NumberEdit = QtGui.QLineEdit()
        self.NumberEdit.setFont(QtGui.QFont('', 11))

        self.UnitEdit1 = QtGui.QCheckBox('mm', self)
        self.UnitEdit1.setFocusPolicy(QtCore.Qt.NoFocus)
        self.UnitEdit1.setFont(QtGui.QFont('', 11))

        self.UnitEdit2 = QtGui.QCheckBox('sm', self)
        self.UnitEdit2.setFocusPolicy(QtCore.Qt.NoFocus)
        self.UnitEdit2.setFont(QtGui.QFont('', 11))

        self.UnitEdit3 = QtGui.QCheckBox('m', self)
        self.UnitEdit3.setFocusPolicy(QtCore.Qt.NoFocus)
        self.UnitEdit3.setFont(QtGui.QFont('', 11))

        self.Convert_Unit_Edit1 = QtGui.QCheckBox('mm', self)
        self.Convert_Unit_Edit1.setFocusPolicy(QtCore.Qt.NoFocus)
        self.Convert_Unit_Edit1.setFont(QtGui.QFont('', 11))

        self.Convert_Unit_Edit2 = QtGui.QCheckBox('sm', self)
        self.Convert_Unit_Edit2.setFocusPolicy(QtCore.Qt.NoFocus)
        self.Convert_Unit_Edit2.setFont(QtGui.QFont('', 11))

        self.Convert_Unit_Edit3 = QtGui.QCheckBox('m', self)
        self.Convert_Unit_Edit3.setFocusPolicy(QtCore.Qt.NoFocus)
        self.Convert_Unit_Edit3.setFont(QtGui.QFont('', 11))

        self.Label = QtGui.QLabel('Convertation Result: ')
        self.Label.setFont(QtGui.QFont('', 11))

        self.LabelR = QtGui.QLabel()
        self.LabelR.setFont(QtGui.QFont('Consolas', 16))

        Run = QtGui.QPushButton('Run', self)
        Run.setFont(QtGui.QFont('Consolas', 14))

        grid = QtGui.QGridLayout()
        grid.setSpacing(10)

        grid.addWidget(Number, 1, 0)
        grid.addWidget(self.NumberEdit, 1, 1, 1, 2)

        grid.addWidget(Unit, 2, 0)
        grid.addWidget(self.UnitEdit1, 2, 1)
        grid.addWidget(self.UnitEdit2, 2, 2)
        grid.addWidget(self.UnitEdit3, 2, 3)

        grid.addWidget(Convert_Unit, 3, 0)
        grid.addWidget(self.Convert_Unit_Edit1, 3, 1)
        grid.addWidget(self.Convert_Unit_Edit2, 3, 2)
        grid.addWidget(self.Convert_Unit_Edit3, 3, 3)

        grid.addWidget(self.Label, 4, 0)
        grid.addWidget(self.LabelR, 4, 1)

        grid.addWidget(Run, 6, 3)

        self.setLayout(grid)
        self.resize(300, 150)

        self.connect(Run, QtCore.SIGNAL('clicked()'), self.showResult)

    def showResult(self):
        result = self.NumberEdit.text()
        if self.UnitEdit1.isChecked:
            if self.Convert_Unit_Edit1.isChecked():
                result = float(self.NumberEdit.text())
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit1.text()))
            elif self.Convert_Unit_Edit2.isChecked():
                result = float(self.NumberEdit.text()) / 10
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit2.text()))
            elif self.Convert_Unit_Edit3.isChecked():
                result = float(self.NumberEdit.text()) / 1000
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit3.text()))
        if self.UnitEdit2.isChecked():
            if self.Convert_Unit_Edit1.isChecked():
                result = float(self.NumberEdit.text()) * 10
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit1.text()))
            elif self.Convert_Unit_Edit2.isChecked():
                result = float(self.NumberEdit.text())
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit2.text()))
            elif self.Convert_Unit_Edit3.isChecked():
                result = float(self.NumberEdit.text()) / 100
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit3.text()))
        if self.UnitEdit3.isChecked():
            if self.Convert_Unit_Edit1.isChecked():
                result = float(self.NumberEdit.text()) * 1000
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit1.text()))
            elif self.Convert_Unit_Edit2.isChecked():
                result = float(self.NumberEdit.text()) * 100
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit2.text()))
            elif self.Convert_Unit_Edit3.isChecked():
                result = float(self.NumberEdit.text())
                self.LabelR.setText(str(result)+' '+str(self.Convert_Unit_Edit3.text()))

    def closeEvent(self, event):
        reply = QtGui.QMessageBox.question(self, 'Message', 'Are you sure to quit', QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)

        if reply == QtGui.QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

app = QtGui.QApplication(sys.argv)
form = Converter()
form.show()
sys.exit(app.exec_())