human
Can you provide a the Python program you requested given the following:
Complete the below
def _invalidates_cache(f):

    ''''Decorator for rruleset methods which may invalidate the
    cached length.'
    '''
assistant
#Here is the Python program you requested.
    def inner_func(self, *args, **kwargs):
        rv = f(self, *args, **kwargs)
        self._invalidate_cache()
        return rv
    return inner_func