code: def validate_inferred_freq(freq, inferred_freq, freq_infer):
      
      if inferred_freq is not None:
          if freq is not None and freq != inferred_freq:
              raise ValueError('Inferred frequency {inferred} from passed '
                               'values does not conform to passed frequency '
                               '{passed}'
                               .format(inferred=inferred_freq,
                                       passed=freq.freqstr))
          elif freq is None:
              freq = inferred_freq
          freq_infer = False
  
      return freq, freq_infer
docs: If the user passes a freq and another freq is inferred from passed data,
      require that they match.
  
      Parameters
      ----------
      freq : DateOffset or None
      inferred_freq : DateOffset or None
      freq_infer : bool
  
      Returns
      -------
      freq : DateOffset or None
      freq_infer : bool
  
      Notes
      -----
      We assume at this point that `maybe_infer_freq` has been called, so
      `freq` is either a DateOffset object or None.