On Feb 26, 3:43 am, "bambam" <[EMAIL PROTECTED]> wrote:
> I have a class containing a series of classes like this:
>
> class Th(Externaldevice):
> class _Communicate(commandset2.CommandSet_Communicate):
> def __getattribute__(self,attrname):
> attr =
> commandset2.CommandSet_Communicate.__getattribute__(self,attrname)
> if "__call__" in dir(attr):
> return functools.partial(Th._wrapper_function, self.parent, attr)
> else:
> return attr
>
> class _System(commandset2.CommandSet_System):
> def __getattribute__(self,attrname):
> attr = commandset2.System_Communicate.__getattribute__(self,attrname)
> if "__call__" in dir(attr):
> return functools.partial(Th._wrapper_function, self.parent, attr)
> else:
> return attr
>
> That is, a a wrapper function is applied to a bunch of methods in a bunch of
> classes.
> The class declarations are simple, but even so, repetitive.
> Can anyone suggest a more compact representation for the class declarations?
> Also, because the parent class name is given explicitly in the class
> declarations, I can't over-ride the _wrapper_function in a child class,
> except by over-riding each of the class declarations. Is there a way to
> reference the _wrapper_function just to the containing class?
>
> Steve
No real idea what you're doing, but surely altering the class at
creation-time, rather than on each attribute call, would be a better
approach? Here's one idea (sorry if misunderstood your problem):
[code python]
import inspect
def wrapped(func):
def wrapper(self, arg):
return func(self, self.parent + ': ' + arg)
return wrapper
class Meta(type):
def __new__(cls, name, bases, attrs):
for key, val in attrs.iteritems():
if inspect.isfunction(val) and not key.startswith('_'):
attrs[key] = wrapped(val)
return super(Meta, cls).__new__(cls, name, bases, attrs)
class Base(object):
__metaclass__ = Meta
parent = 'root'
def foo(self, s):
return s.upper()
def bar(self, s):
return s.lower()
b = Base()
print b.foo('apple')
print b.bar('PEAR')
print
b.parent = 'firstchild'
print b.foo('apple')
print b.bar('PEAR'
[/code]
ROOT: APPLE
root: pear
FIRSTCHILD: APPLE
firstchild: pear
Gerard
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