Ed Leafe wrote:
> I have a simple module that reads in values from disk when imported,
> and stores them in attributes, allowing for code like:
>
> >>> import moduleFoo
> >>> print moduleFoo.someSetting
> 'the value'
>
> What I'd like to do is have a more property-like behavior, so that
> if they try to set the value of moduleFoo.someSetting, it also persists
> it to disk. But properties are really only useful in instances of
> classes; if I define 'someSetting' as a property at the module level, I
> get:
>
> >>> import moduleFoo
> >>> print moduleFoo.someSetting
> <property object at 0x78a990>
>
> Does anyone know any good tricks for getting property-like behavior
> here?
I typically define a module wrapping class like::
class GiveThisModuleProperties(object):
def __init__(self, module_name):
self._module = sys.modules[module_name]
sys.modules[module_name] = self
# now define whatever behavior you need
def __getattr__(...):
...
def __setattr__(...):
...
Then, in the module you want wrapped, you write::
GiveThisModuleProperties(__name__)
The trick here is basically that we replace the module object in
sys.modules with a class instance that wraps the module with whatever
extra behavior is necessary.
It's not beautiful, but it does seem to work. ;-)
STeVe
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