Sandbox — LSD is in active testing. All systems operational·payments are test-mode (no real charges).

API Reference

Authoring

Data

Views

Runtime

Tool Packaging

Column.is_valid

a bool column, true where the value is present (not null)

Python

is_valid() -> Column

Returns Column — a boolean Column, true where the value is not null

Example#

Python

t.filter(t["name"].is_valid())      # drop rows whose name is null

Combine it with other conditions:

Python

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

Produces a boolean Column (a mask) you pass to filter. It is the exact complement of is_null.