# pandas.PeriodIndex.asfreq

`PeriodIndex.``asfreq`(*args, **kwargs)

  Convert the Period Array/Index to the specified frequency freq.

  Parameters:

  freq : str

  > a frequency

  how : str {‘E’, ‘S’}

  > ‘E’, ‘END’, or ‘FINISH’ for end, ‘S’, ‘START’, or ‘BEGIN’ for start. Whether the elements should be aligned to the end or start within pa period. January 31st (‘END’) vs. January 1st (‘START’) for example.

  Returns: | new : Period Array/Index with the new frequency

  Examples

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

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

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

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