import xbmcgui

class MyClass(xbmcgui.WindowXMLDialog):
	def __init__(self, myparam):
		print("myparam", myparam)

if (__name__ == '__main__'):
	myclass = MyClass("hello")

Error is:
Error Type: <type 'exceptions.TypeError'>
                                            Error Contents: function takes at least 2 arguments (1 given)
                                            Traceback (most recent call last):
                                              File "C:\Kodi\addons\script.test\resources\lib\Main.py", line 8, in __init__
                                                myclass = MyClass("hello")
                                            TypeError: function takes at least 2 arguments (1 given)