polars len
For dataframe.
Return the number of rows in the context. This is similar to COUNT(*) in SQL.
warning This command requires a plugin The
polars lencommand resides in thepolarsplugin. To use this command, you must install and registernu_plugin_polars. See the Plugins chapter in the book for more information.
Command Type
plugin
Signature
> polars len {flags}
Input/output types:
| input | output |
|---|---|
| any | polars_expression |
Examples
Count the number of rows in the dataframe.
> [[a b]; [1 2] [3 4]] | polars into-df | polars select (polars len) | polars collect
╭───┬─────╮
│ # │ len │
├───┼─────┤
│ 0 │ 2 │
╰───┴─────╯
Creates a last expression from a column
> polars col a | polars last
Ported from nushell/nushell.github.io. Copyright (c) 2021 Nushell Project. MIT License.