On Tue, 27 Oct 2009 10:43:42 -0700, Felipe Ochoa wrote:
> I need to create a subclass from a parent class that has lots of
> methods, and need to decorate all of these. Is there pythonic way of
> doing this other than:
>
> def myDecorator (meth):
> @wraps(meth)
> def newMeth (*args, **kw):
> print("Changing some arguments here.") return meth(newargs,
> **kw)
> return newMeth
>
> class Parent:
> def method1(self,args):
> pass
> def method2(self,args):
> # and so on...
> def methodn(self,args):
> pass
>
> class Mine(Parent):
> for thing in dir(Parent):
> if type(eval("Parent."+thing)) == type(Parent.method1):
> eval(thing) = myDecorator(eval("Parent." + thing))
>
> I'm not even sure that this works! Thanks a lot!
eval() won't work there. exec might, but any time you think you need eval/
exec, you probably don't :)
You can probably do some magic with metaclasses, but the simplest
solution would be something like this:
class Mine(Parent):
pass
import types
for name in dir(Mine):
attr = getattr(Mine, name)
if type(attr) in (types.MethodType, types.UnboundMethodType):
setattr(Mine, name, myDecorator(attr))
The above (probably) won't touch classmethods and staticmethods.
--
Steven
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