import PyQt4
from PyQt4 import QtGui,QtCore

class TestWinUI(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
 
        # always on top
        self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
        #location and size
        self.setGeometry(300, 300, 300, 300)
        #title
        self.setWindowTitle("My Tool - v1.0")
        #resize
        self.resize(250,250)
        #icon
        self.setWindowIcon(QtGui.QIcon('icon.png'))
        #center
        self.center()
        #fixed size
        self.setFixedHeight(500)
        self.setMinimumHeight( 0 )
        self.setMaximumHeight( 2048 )
        self.setMinimumSize(128, 128)
        self.setMaximumSize(128, 128)
        # maximized
        self.showMaximized()
        # show and hide
        self.setVisible(True)
 
    def center(self):
        qr = self.frameGeometry()
        cp = QtGui.QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())  
 
def main():
    global myWin
    myWin=TestWinUI()
    myWin.show()