Pattern question

[Scott David Daniels]

cantabile wrote:
> bruno modulix a écrit :
>>You may want to have a look at the Factory pattern...
>> ... demo of class Factory ...

Taking advantage of Python's dynamic nature, you could simply:
     # similarly outrageously oversimplified dummy example
     class Gui(object):
        def __init__(self, installer):
            self.installer = installer

     class PosixGui(Gui):
         pass

     class Win32Gui(Gui):
         pass

     if os.name == 'posix':
         makeGui = PosixGui
     elif os.name == 'win32':
         makeGui = Win32Gui
     else:
         raise "os %s not supported" % os.name


     class Installer(object):
         def __init__(self, guiFactory):
             self.gui = guiFactory(self)

     def main():
         inst = Installer(makeGui)
         return inst.gui.main()

--Scott David Daniels
Scott.Daniels at Acm.Org