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pandas.Index.dropna

Index.dropna(self, how='any') [source]

Return Index without NA/NaN values

Parameters:
how : {‘any’, ‘all’}, default ‘any’

If the Index is a MultiIndex, drop the value when any or all levels are NaN.

Returns:
valid : Index

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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.25.0/reference/api/pandas.Index.dropna.html