pandas.DataFrame.last_valid_index
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DataFrame.last_valid_index()[source] -
Return index for last non-NA/null value.
Returns: -
scalar : type of index
Notes
If all elements are non-NA/null, returns None. Also returns None for empty NDFrame.
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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.DataFrame.last_valid_index.html