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Pandas · Method

df.join

DataFrame.join adds columns from another DataFrame or Series. It matches indexes by default, or matches a caller column to the other object's index with on.

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Syntax

DataFrame.join(other, on=None, how='left', lsuffix=<no_default>, rsuffix=<no_default>, sort=False, validate=None, *, suffixes=<no_default>)

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  • pandas.DataFrame.merge

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