pandas / 1.4.0 / reference / api / pandas.series.backfill.html /

pandas.Series.backfill

Series. backfill ( axis=None, inplace=False, limit=None, downcast=None ) [source]

Synonym for DataFrame.fillna() with method='bfill'.

Returns
Series/DataFrame or None

Object with missing values filled or None if inplace=True.

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https://pandas.pydata.org/pandas-docs/version/1.4.0/reference/api/pandas.Series.backfill.html