Jan Eden wrote:
> Not exactly. My current setup bundles all data attributes in a single
> module Data containing a single class for each object. So in my main
> module (Show), I define:>
> class Page(Data.Page):
> ...
>
> and Data contains:
>
> class Base:
> children = 'xyz'
> children_query = 'SELECT...'
>
> class Page:
> children = 'something'
> own_type = 'somethingelse'
> populate_query = "SELECT ..."
> index_link = "<p>..."
> ...
>
> So I can use self.children_query for an object of class Show.Page to
> get the data attribute defined in class Data.Base.
>
> But since there are many data attributes, I'd like to use things like:
>
> self.templates['index_link']
> self.templates['child_link']
> self.queries['populate']
>
> or
>
> self.Templates.index_link
> self.Templates.child_link
> self.Queries.populate
OK I'll try again. I still don't understand why you don't like using straight
class attributes - is it to keep the size of the class namespace smaller?
I'm also not sure if you want to be able to access Base.children and
Page.children from a subclass of Page. If not, then you can use a hierarchical
dictionary to do what you want. How about this?
import UserDict
class ChainDict(UserDict.DictMixin):
''' A dict that will delegate failed lookups to a parent '''
def __init__(self, parent=None):
self._dict = dict()
self._parent = parent
# __setitem__() and __delitem__() delegate to self._dict
self.__setitem__ = self._dict.__setitem__
self.__delitem__ = self._dict.__delitem__
def __getitem__(self, key):
try:
return self._dict[key]
except KeyError:
if self._parent is not None:
return self._parent[key]
def keys(self):
keys = self._dict.keys()
if self._parent is not None:
keys.extend(self._parent.keys())
class Base:
templates = dict()
templates['children'] = 'xyz'
templates['children_query'] = 'SELECT * from Base'
class Page(Base):
templates = ChainDict(Base.templates)
templates['children'] = 'something'
templates['own_type'] = 'somethingelse'
templates['populate_query'] = "SELECT * from Page"
templates['index_link'] = "<p>..."
b = Base()
print b.templates['children']
print b.templates['children_query']
print
p = Page()
print p.templates['children']
print p.templates['children_query']
print p.templates['index_link']
Kent
PS Please reply on list.
--
http://www.kentsjohnson.com
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