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pandas.Series.first_valid_index

Series.first_valid_index() [source]

Return index for first 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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https://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.Series.first_valid_index.html