Dynamic Class Creation

[Chris Rebert]

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
--
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