En Fri, 09 May 2008 10:02:01 -0300, Viktor <[EMAIL PROTECTED]> escribió:
> This completely slipped of my mind... :) > > I'm trying to change the: > http://wordaligned.org/svn/etc/echo/echo.py > > So if the function is method it prints ClassName.MethodName instead of > MethodName(self|klass|cls=<... ClassName>). > > But it turned out that in the decorator, the wrapped function is > always just a TypeFunction (I cannot find out if the function is > method, classmethod, staticmethod or just a plain function - tried > with inspect also)... And what is most interesting, when I do: The decorator receives the original, plain function (unless you chain decorators) and whatever it returns is used instead of the original function. > def w(fn): > print 'fn:', id(fn) > return fn > > class A: > @w > def __init__(self): pass > > print 'A.__init__:', id(A.__init__) > > It turns out that the function I receive in the wrapper (even when I > return the same function) is not the function which will finally be > attached to the class... > Is there a way to find out in the decorator "what will the decorated > function be"? Whatever you return from the decorator. But the decorator returns a *function* and A.__init__ is a *method*, an instance method in fact. The function can be found as A.__dict__['__init__']. Try this: m = A.__init__ print m, type(m), id(m) f = A.__dict__['__init__'] print f, type(f), id(f) A method combines a function with an instance that becomes the "self" argument. In your case you're building an "unbound" method because it's not tied to a particular instance, but even such unbound method is not the same thing as a plain function (it must ensure that its first argument, when called, is an A instance and not any other object). The "magic" that converts a simple function into an instance method, for old-style classes like yours, was in the Class type itself. For new style classes, the descriptor protocol is used. See http://www.python.org/doc/newstyle/ -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
