Infer the most likely frequency given the input index.
If passed a Series will use the values of the series (NOT THE INDEX).
None if no discernible frequency.
If the index is not datetime-like.
If there are fewer than three values.
Examples
>>> idx = pd.date_range(start='2020/12/01', end='2020/12/30', periods=30) >>> pd.infer_freq(idx) 'D'
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