[Python] Why can @decorator not decorate a staticmethod or a classmethod?

Why can decorator not decorate a staticmethod or a classmethod in Python 2.6?

from decorator import decorator

@decorator
def print_function_name(function, *args):
print '%s was called.' % function.func_name
return function(*args)

class My_class(object):
@print_function_name
@classmethod
def get_dir(cls):
return dir(cls)

@print_function_name
@staticmethod
def get_a():
return 'a'


Both get_dir and get_a result in AttributeError: <'classmethod' or 'staticmethod'>, object has no attribute '__name__'.

Why does decorator rely on the attribute __name__ instead of the attribute func_name? (Afaik all functions, including classmethods and staticmethods, have the func_name attribute.)

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