DataFrame.to_period()
pandas.DataFrame.to_period
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DataFrame.to_period(freq=None, axis=0, copy=True)
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Convert DataFrame from DatetimeIndex to PeriodIndex with desired frequency (inferred from index if not passed)
Parameters: freq : string, default
axis : {0 or ‘index’, 1 or ‘columns’}, default 0
The axis to convert (the index by default)
copy : boolean, default True
If False then underlying input data is not copied
Returns: ts : TimeSeries with PeriodIndex