gistfile1.py

import decorator

def multiplier(n):
    # will multiply the first incoming argument by n.
    def internal(fn, arg):
        return fn(arg*n)
    return decorator.decorator(internal)

@multiplier(3)
def foo(arg):
    print arg

foo(4)

def multiplier_for_method(n):
    # will multiply the first incoming argument by n.
    def internal(fn, self, arg):
        return fn(self, arg*n)
    return decorator.decorator(internal)

class bar(object):
    @multiplier_for_method(4)
    def foo(self, arg):
        print self
        print arg
    
    @multiplier(5) # this won't work, since baz takes two arguments, but the decorator does not.
    def baz(self, arg):
        print self
        print arg

bar().foo(4)

bar().baz(5)