@Substitution(name='groupby')
    @Appender(_doc_template)
    def std(self, ddof=1):

        # todo, implement at cython level?
        return np.sqrt(self.var(ddof=ddof))
A decorator that is used to cache a function with supplied
dataset/ETHPy150Open pydata/pandas/pandas/core/groupby.py/GroupBy.std--crossover with--dataset/ETHPy150Open fengsp/rc/rc/cache.py/BaseCache.cache