# Column.is_valid
URL: https://lsd.tools/docs/api-column-is-valid
Updated: 2026-07-17

## 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())
```

## Notes

Produces a boolean `Column` (a mask) you pass to [`filter`](/docs/api-table-filter). It is the
exact complement of [`is_null`](/docs/api-column-is-null).

## See also

**API:** [is_null](/docs/api-column-is-null) · [Table.filter](/docs/api-table-filter) · [Column](/docs/api-column)

**Guides:** [Tables & data flow](/docs/tools-tables) · [Clean a CSV](/docs/ex-clean-csv)