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年12月01日', end='2020年12月30日', periods=30)
>>> pd.infer_freq(idx)
'D'