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pandas.DatetimeIndex.to_perioddelta

DatetimeIndex.to_perioddelta(freq) [source]

Calcuates TimedeltaIndex of difference between index values and index converted to PeriodIndex at specified freq. Used for vectorized offsets

New in version 0.17.0.

Parameters: freq : Period frequency
Returns: y : TimedeltaIndex

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http://pandas.pydata.org/pandas-docs/version/0.20.2/generated/pandas.DatetimeIndex.to_perioddelta.html