Tries to return a string representing a frequency generated by infer_freq.
Returns None if it can’t autodetect the frequency.
Examples
For DatetimeIndex:
>>> idx = pd.DatetimeIndex(["2018-01-01", "2018-01-03", "2018-01-05"])
>>> idx.inferred_freq
'2D'
For TimedeltaIndex:
>>> tdelta_idx = pd.to_timedelta(["0 days", "10 days", "20 days"])
>>> tdelta_idx
TimedeltaIndex(['0 days', '10 days', '20 days'],
dtype='timedelta64[ns]', freq=None)
>>> tdelta_idx.inferred_freq
'10D'
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.TimedeltaIndex.inferred_freq.html