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# pandas.infer_freq

pandas.infer_freq(index)

  Infer the most likely frequency given the input index.

  Parameters:
    indexDatetimeIndex, TimedeltaIndex, Series or array-like

      If passed a Series will use the values of the series (NOT THE INDEX).

  Returns:
    str or None

      None if no discernible frequency.

  Raises:
    TypeError

      If the index is not datetime-like.

    ValueError

      If there are fewer than three values.

  Examples

      >>> idx = pd.date_range(start='2020/12/01', end='2020/12/30', periods=30)
      >>> pd.infer_freq(idx)
      'D'