code: def anlzd_stdev(self, ddof=0, freq=None, **kwargs):
          
  
          if freq is None:
              freq = self._try_get_freq()
              if freq is None:
                  raise FrequencyError(msg)
          return nanstd(self, ddof=ddof) * freq ** 0.5
docs: Annualized standard deviation with `ddof` degrees of freedom.
  
          Parameters
          ----------
          ddof : int, default 0
              Degrees of freedom, passed to pd.Series.std().
          freq : str or None, default None
              A frequency string used to create an annualization factor.
              If None, `self.freq` will be used.  If that is also None,
              a frequency will be inferred.  If none can be inferred,
              an exception is raised.
  
              It may be any frequency string or anchored offset string
              recognized by Pandas, such as 'D', '5D', 'Q', 'Q-DEC', or
              'BQS-APR'.
          **kwargs
              Passed to pd.Series.std().
          TODO: freq
  
          Returns
          -------
          float