pandas.DataFrame.last_valid_index

DataFrame.last_valid_index(): Возвращает метку для последнего не-NA/null значения

© 2008–2012, AQR Capital Management, LLC, Lambda Foundry, Inc. and PyData Development Team
Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DataFrame.last_valid_index.html