code: def _raise_on_incompatible(left, right):
      
      # GH#24283 error message format depends on whether right is scalar
      if isinstance(right, np.ndarray):
          other_freq = None
      elif isinstance(right, (ABCPeriodIndex, PeriodArray, Period, DateOffset)):
          other_freq = right.freqstr
      else:
          other_freq = _delta_to_tick(Timedelta(right)).freqstr
  
      msg = DIFFERENT_FREQ.format(cls=type(left).__name__,
                                  own_freq=left.freqstr,
                                  other_freq=other_freq)
      raise IncompatibleFrequency(msg)
docs: Helper function to render a consistent error message when raising
      IncompatibleFrequency.
  
      Parameters
      ----------
      left : PeriodArray
      right : DateOffset, Period, ndarray, or timedelta-like
  
      Raises
      ------
      IncompatibleFrequency