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pandas.Index.dropna

Index.dropna(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
Index

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https://pandas.pydata.org/pandas-docs/version/1.5.0/reference/api/pandas.Index.dropna.html