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Docs/ API Reference/ Table/ with_column
Table· method

Table.with_column

adds or replaces a column from a column expression or array

Python
with_column(name: str, value: Any) -> Table

Returns Table — a new Table with the column added or replaced

Parameters#

name type default description
name str — the column to add or overwrite
value Column | pa.Array — a Column expression or a pyarrow array to store under name

Example#

Python
t.with_column("bonus", t["score"] * 2)     # add a computed column

Reusing the name replaces the existing column:

Python
t.with_column("score", t["score"] + 1)     # overwrite in place (new Table)

Notes#

If name already exists it is replaced; otherwise it is appended as a new last column. Every call returns a new Table — the original is untouched.

See also#

API: filter · select · Column

Guides: Tables & data flow

By LSD Team · Last updated Jul 17, 2026 Ask on Discord View as Markdown