pandas.Series.asof

Series.asof(where)

Return last good (non-NaN) value in Series if value is NaN for requested date.

If there is no good value, NaN is returned.

Parameters:	where : date or array of dates
Returns:	value or NaN

Dates are assumed to be sorted

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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.asof.html