t.py

def random_device(reuse_owner=False, **kwds):
    def wrapper(f):
        def wrapped(self):
            if reuse_owner and hasattr(self, 'device'):
                print "Reusing owner %s" % self.device
                d = self.device
            else:
                print "no owner"
                d = 'A NEW DEVICE'
            self.device = d
            return f(self)
        return wrapped
    return wrapper


class Foo(object):

    def __init__(self):
        self.x = 10

    @random_device(reuse_owner=True)
    def something(self, **kwargs):
        print kwargs
        print self.x
        print self.device

Foo().something()


# Reusing owner lol
# {}
# 10
# lol