Pattern question

cantabile cantabile.03 at wanadoo.fr
Sat Jul 9 11:03:35 CEST 2005


Scott David Daniels a écrit :
> 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

Thank you too for this tip. :)
Coming from C++ (mainly), I'm not used to this dynamic way of doing
things. That's usefull.



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