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# pandas.PeriodIndex.asfreq

PeriodIndex.asfreq(freq=None, how='E')

  Convert the PeriodIndex to the specified frequency freq.

  Equivalent to applying `pandas.Period.asfreq()` with the given arguments to each `Period` in this PeriodIndex.

  Parameters:
    freq str

      A frequency.

    how str {‘E’, ‘S’}, default ‘E’

      Whether the elements should be aligned to the end or start within pa period.

      - ‘E’, ‘END’, or ‘FINISH’ for end,

      - ‘S’, ‘START’, or ‘BEGIN’ for start.

      January 31st (‘END’) vs. January 1st (‘START’) for example.

  Returns:
    PeriodIndex

      The transformed PeriodIndex with the new frequency.

  See also

  `arrays.PeriodArray.asfreq`

    Convert each Period in a PeriodArray to the given frequency.

  `Period.asfreq`

    Convert a `Period` object to the given frequency.

  Examples

      >>> pidx = pd.period_range("2010-01-01", "2015-01-01", freq="Y")
      >>> pidx
      PeriodIndex(['2010', '2011', '2012', '2013', '2014', '2015'],
      dtype='period[Y-DEC]')

      >>> pidx.asfreq("M")
      PeriodIndex(['2010-12', '2011-12', '2012-12', '2013-12', '2014-12',
      '2015-12'], dtype='period[M]')

      >>> pidx.asfreq("M", how="S")
      PeriodIndex(['2010-01', '2011-01', '2012-01', '2013-01', '2014-01',
      '2015-01'], dtype='period[M]')