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Docs/ API Reference/ Table/ filter
Table· method

Table.filter

keeps the rows where a boolean mask column is true

Python
filter(mask: Column) -> Table

Returns Table — a new immutable Table with only the matching rows

Parameters#

name type default description
mask Column — a boolean Column expression, e.g. t["score"] > 10

Example#

Python
t.filter(t["score"] > 10)          # → only the high scorers

Combine conditions with & (and), | (or), ~ (not):

Python
t.filter((t["score"] > 10) & t["name"].is_valid())

Notes#

mask must be a boolean Column built from the same table — comparisons (> >= < <= == !=), & / | / ~, and is_valid() / is_null() all produce one. Every call returns a new Table; the original is untouched.

See also#

API: select · sort · Column

Guides: Tables & data flow

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