pandas.DataFrame.first_valid_index

DataFrame. first_valid_index ( ) [source]

Return index for first non-NA value or None, if no NA value is found.

Returns

Notes

If all elements are non-NA/null, returns None. Also returns None for empty Series/DataFrame.

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https://pandas.pydata.org/pandas-docs/version/1.4.0/reference/api/pandas.DataFrame.first_valid_index.html