Can a method be used as either a staticmethod or instance method?

Question

I'd like to be able to do this:

class A(object):
    @staticandinstancemethod
    def B(self=None, x, y):
        print self is None and "static" or "instance"

A.B(1,2)
A().B(1,2)

This seems like a problem that should have a simple solution, but I can't think of or find one.

Answer 1

It is possible, but please don't. I couldn't help but implement it though:

class staticandinstancemethod(object):
     def __init__(self, f):
          self.f = f

     def __get__(self, obj, klass=None):
          def newfunc(*args, **kw):
               return self.f(obj, *args, **kw)
          return newfunc

...and its use:

>>> class A(object):
...     @staticandinstancemethod
...     def B(self, x, y):
...         print self is None and "static" or "instance"

>>> A.B(1,2)
static
>>> A().B(1,2)
instance

Evil!