pandas / 1.4.0 / reference / api / pandas.infer_freq.html /

pandas.infer_freq

pandas. infer_freq ( index, warn=True ) [source]

Infer the most likely frequency given the input index. If the frequency is uncertain, a warning will be printed.

Parameters
index :DatetimeIndex or TimedeltaIndex

If passed a Series will use the values of the series (NOT THE INDEX).

warn :bool, default True
Returns
str or None

None if no discernible frequency.

Raises
TypeError

If the index is not datetime-like.

ValueError

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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https://pandas.pydata.org/pandas-docs/version/1.4.0/reference/api/pandas.infer_freq.html