Changing global variables in tkinter/pmw callback

[Steve Holden]

"Jonathan Claggett" <jcc.ugm at ix.netcom.com> wrote in message
news:mailman.986578990.10259.python-list at python.org...
>
> >(Or, you could use a 'grab-bag instance object' -- it
> >does not have to be a module-object; see for example
> >http://www.activestate.com/ASPN/Python/Cookbook/Recipe/52308).
>
> How about improving the Bunch class to allow subscript access to its
> attributes? This makes an instance of Bunch reminiscent of a Javascript
> instance.
>
> >>> class Bunch:
> ... def __init__(self, **kwds):
> ...     self.__dict__.update(kwds)
> ... def __setitem__(self, key, value):
> ...     self.__dict__[key] = value
> ... def __getitem__(self, key):
> ...     return self.__dict__[key]
> ...
> >>> ex = Bunch(salary=10000, rank=5)
> >>> ex.rank
> 5
> >>> ex['salary']
> 10000
>
>
> Or is this asking for trouble that I, an affirmed Python newbie, would not
> be aware of? That's the trouble with languages, in addition to the syntax
> rules there are always the undocumented 'good practice' rules :-)
>
The main idea of the Bunch is to make this unnecessary, but it seems like a
reasonably logical extension apart from that. I would argue it isn't really
an improvement, but I may be being purist.

Of course, if you are *only* going to use subscripted access there's no
point using a Bunch, since that's exactly what a dictionary gives you in the
first place.

regards
 Steve