Doctests and decorated methods don't get along

[John Posner]

On 2/6/2010 6:48 AM, Steven D'Aprano wrote:
> class MyStaticMethod(object):
>      """Emulate built-in staticmethod descriptor."""
>      def __init__(self, f):
>          self.f = f
>      def __get__(self, obj, objtype=None):
>          return self.f

How about using a function, instead of a class, to implement the decorator:

import functools
def MyStaticMethod(f):
     @functools.wraps(f)
     def _wrapper(*args, **kwargs):
         return f(*args, **kwargs)
     return _wrapper


For me, this produces the hoped-for doctest failure in 
__main__.Test.method3.

I tried making the class-based implementation work by using 
functools.wraps(), but I couldn't manage it. Also, doesn't the decorator 
protocol want the class to implement a __call__() method, not a 
__get__() method? Or am I getting hung up (not the first time) at the 
nexus of the descriptor and decorator protocols?

-John