pandas.infer_freq#

pandas.infer_freq(index)[source]#

Infer the most likely frequency given the input index.

Parameters:
indexDatetimeIndex, TimedeltaIndex, Series or array-like

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

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'