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/pandas 0.23

pandas.Index.asof

Index.asof(label) [source]

For a sorted index, return the most recent label up to and including the passed label. Return NaN if not found.

See also

get_loc
asof is a thin wrapper around get_loc with method=’pad’

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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.Index.asof.html