polars count for dataframe
Returns the number of non-null values in the column.
Signature
> polars count {flags}
Input/output types:
| input | output |
|---|---|
| polars_expression | polars_expression |
| polars_selector | polars_expression |
Examples
Count the number of non-null values in a column
> [[a]; ["foo"] ["bar"] [null]] | polars into-df
| polars select (polars col a | polars count)
| polars collect
╭───┬───╮
│ # │ a │
├───┼───┤
│ 0 │ 2 │
╰───┴───╯
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https://www.nushell.sh/commands/docs/polars_count.html
