import sys
from PyQt4 import QtGui, QtCore

class Window (QtGui.QMainWindow):

    def __init__(self):
        super (Window, self). __init__()
        self.setGeometry(400, 250, 500, 200)
        self.setWindowTitle("Login")

        self.home()

    def home (self):

        lblUser = QtGui.QLabel("Username", self)
        lblUser.setStyleSheet('font: 13pt Arial')
        lblUser.move(100, 70)

        lineUser = QtGui.QLineEdit(self)
        lineUser.setStyleSheet('font: 11pt Arial')
        lineUser.move(190, 73)
        lineUser.resize(150, 20)

        lblPass = QtGui.QLabel("Password", self)
        lblPass.setStyleSheet('font: 13pt Arial')
        lblPass.move(100, 100)

        linePass = QtGui.QLineEdit(self)
        linePass.setStyleSheet('font: 11pt Arial')
        linePass.setEchoMode(QtGui.QLineEdit.Password)
        linePass.move(190, 103)
        linePass.resize(150, 20)

        btnLog = QtGui.QPushButton("Login", self)
        btnLog.setStyleSheet('font: 11pt Arial')
        btnLog.clicked.connect(self.Login)
        btnLog.move(100, 140)

        self.show()

    def Quit(self):
        choice = QtGui.QMessageBox.question(self, 'Quit Application',
                                            "Are you sure you want to quit?",
                                            QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
        if choice == QtGui.QMessageBox.Yes:
                sys.exit()
        else:
                pass

    def Login(self):

        if (lineUser.text() == 'admin' and
            linePass.text() == '123'):
            self.accept()
        else:
            QtGui.QMessageBox.warning(self, "Incorrect Username or Password")

def run():
    app = QtGui.QApplication(sys.argv)
    Gui = Window()
    sys.exit(app.exec_())

run()