Conditional decoration

[Emile van Sebille]

On 6/18/2012 3:16 PM Roy Smith said...
> Is there any way to conditionally apply a decorator to a function?
> For example, in django, I want to be able to control, via a run-time
> config flag, if a view gets decorated with @login_required().
>
> @login_required()
> def my_view(request):
>      pass


class myDecorator(object):
     def __init__(self, f):
         self.f = f
     def __call__(self):
         print "Entering", self.f.__name__
         self.f()
         print "Exited", self.f.__name__


def null(a): return a


#if condition:
myDecorator = null


@myDecorator
def aFunction():
     print "aFunction running"

aFunction()


Cobbled together from http://www.chrisevans3d.com/pub_blog/?p=530 and 
http://stackoverflow.com/questions/3687046/python-sphinx-autodoc-and-decorated-members

HTH

Emile