En Fri, 23 May 2008 16:25:19 -0300, Thomas Karolski <[EMAIL PROTECTED]> escribió:
> Turns out the first msg I sent did not reach the list, so I'll just post > what I've achieved by now: [snip a couple of long metaclasses] > Now the reason why I'm using decorators, is because I want to be ably to > add the functionality dynamicly - without the need of construction > classes for the different possibilities. Composite pattern does not help > in this case, since I lose the ability to choose in what order I call > the decorator's and the decorated's methods. I haven't looked in detail to your code, but if that is what you want, you don't need a Decorator metaclass at all. Just add/replace the desired methods inside the class itself (Python is a dynamic language, remember). py> class A(object): ... def foo(self): print "In foo, self=", self ... py> def bar(self): print "In bar, self=", self ... py> a = A() py> a.foo() In foo, self= <__main__.A object at 0x00A3CD50> py> py> A.bar = bar py> a.bar <bound method A.bar of <__main__.A object at 0x00A3CD50>> py> a.bar() In bar, self= <__main__.A object at 0x00A3CD50> You can even add methods to individual instances: py> def baz(self): print "In baz, self=", self ... py> import new py> b = A() py> b.baz = new.instancemethod(baz, b, type(b)) py> a.baz() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'A' object has no attribute 'baz' py> b.baz <bound method A.baz of <__main__.A object at 0x00A3CDD0>> py> b.baz() In baz, self= <__main__.A object at 0x00A3CDD0> -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
