On Tue, Mar 16, 2010 at 9:49 AM, Jack Diederich <jackdied at gmail.com> wrote: > On Tue, Mar 16, 2010 at 2:18 AM, Chris Rebert <clp2 at rebertia.com> wrote: >> On Mon, Mar 15, 2010 at 11:01 PM, Josh English >> <joshua.r.english at gmail.com> wrote: <snip> >>> What's the best way to create these helper methods? > > You can either define a catch-all __getattr__ method to look them up > dynamically, or as Chris kinda-suggested write descriptors for the > individual elements. > > class Market(): > def __init__(self, elem): > self._elem = elem > def __getattr__(self, name): > try: > # I'm assuming this raises a KeyError when not found > return self._elem.get(name) > except KeyError: > return self._elem.find(name) > def __setitem__(self, name, value): did you mean __setattr__ here? <snip> > The getattr/setattr method is easier to understand and will handle > arbitrary elements; for the descriptors version you'll have to define > one for each tag that might be used on the class. Cheers, Chris -- http://blog.rebertia.com
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