import sys
from PySide.QtCore import *
from PySide.QtGui import *
from PySide.QtUiTools import *

def say_hello():
    print("Hello!")

def main():
    app = QApplication(sys.argv)

    loader = QUiLoader()
    dialog = loader.load("./MainWin.ui", None)

    dialog.show()
    return app.exec_()

if __name__ == "__main__":
    sys.exit(main())