pandas.Series.asof

Series.asof(where, subset=None) [source]

The last row without any NaN is taken (or the last row without NaN considering only the subset of columns in the case of a DataFrame)

New in version 0.19.0: For DataFrame

If there is no good value, NaN is returned for a Series a Series of NaN values for a DataFrame

Parameters:	where : date or array of dates subset : string or list of strings, default None if not None use these columns for NaN propagation
Returns:	where is scalar value or NaN if input is Series Series if input is DataFrame where is Index: same shape object as input

See also

merge_asof

Notes

Dates are assumed to be sorted Raises if this is not the case