Get the name of the class of a decorated method in Python 2.7

gistfile1.py

def print_class_name(fn):
    """
    A decorator that prints the name of the class of a bound function (IE, a method).

    NOTE: This MUST be the first decorator applied to the function! E.g.:

        @another_decorator
        @yet_another_decorator
        @print_class_name
        def my_fn(stuff):
            pass

    This is because decorators replace the wrapped function's signature.
    """
    @wraps(fn)
    def inner(*args, **kwargs):
        args_map = {}
        if args or kwargs:
            args_map = inspect.getcallargs(fn, *args, **kwargs)
       
        # We assume that if an argument named `self` exists for the wrapped
        # function, it is bound to a class, and we can get the name of the class
        # from the 'self' argument.
        if 'self' in args_map:
            cls = args_map['self'].__class__
            print 'Function bound to class %s' % cls.__name__
        else:
            print 'Unbound function!'

        return fn(*args, **kwargs)
    return inner