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Pandas · Method

df.where

DataFrame.where keeps values where a condition is true and replaces other values. You can provide a scalar, aligned data, or callable as the replacement.

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Syntax

DataFrame.where(cond, other=<no_default>, *, inplace=False, axis=None, level=None)

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  • DataFrame.mask()
  • Series.mask()

Source: pandas.DataFrame.where — pandas 3.1.0 documentation. Checked 2026-11-03.