DouKaku?

# -*- coding: utf-8 -*-
import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")
from System.Windows.Forms import Form, FormStartPosition, Application
from System.Drawing import Size

class HelloForm(Form):
    def __init__(self):
        self.Text = u'こんにちは、GUI'
        self.StartPosition = FormStartPosition.CenterScreen
        self.Size = Size(100, 75)

if __name__ == '__main__':
    Application.Run(HelloForm())