pandas.Series.to_period#

Series.to_period(freq=None, copy=None)[source]#

Convert Series from DatetimeIndex to PeriodIndex.

Parameters

freqstr, default None: Frequency associated with the PeriodIndex.
copybool, default True: Whether or not to return a copy.

Returns

Series: Series with index converted to PeriodIndex.

Examples

>>> idx = pd.DatetimeIndex(['2023', '2024', '2025'])
>>> s = pd.Series([1, 2, 3], index=idx)
>>> s = s.to_period()
>>> s
2023    1
2024    2
2025    3
Freq: A-DEC, dtype: int64

Viewing the index

>>> s.index
PeriodIndex(['2023', '2024', '2025'], dtype='period[A-DEC]')