Return the frequency object as a string if itâs set, otherwise None.
Examples
For DatetimeIndex:
>>> idx = pd.DatetimeIndex(["1/1/2020 10:00:00+00:00"], freq="D") >>> idx.freqstr 'D'
The frequency can be inferred if there are more than 2 points:
>>> idx = pd.DatetimeIndex(["2018-01-01", "2018-01-03", "2018-01-05"], ... freq="infer") >>> idx.freqstr '2D'
For PeriodIndex:
>>> idx = pd.PeriodIndex(["2023-1", "2023-2", "2023-3"], freq="M") >>> idx.freqstr 'M'
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