Return the number of unique rows, or the number of unique row-subsets. Notes: This method operates at the DataFrame level.

Count unique values. This function is syntactic sugar for pl.col(columns).n_unique() . Parameters:.

Count unique values. Notes. null is considered to be a unique value for the purposes of this operation. Examples.

14 окт. 2022 г. · I need a way to find out how many unique pairs of values from two columns are in a certain context. Basically like n_unique, but as a window function.

Count the unique values per group. Examples. >>> df = pl.

9 окт. 2022 г. · n_unique() is currently limited to single columns. If you specify n_unique() in a groupby context, it'll return number of unique elements in each column ...

9 окт. 2022 г. · Given a dataframe, how do I count the number of [multi-column] unique records within a group, and return the result as a single column?

polars.n_unique#. polars.n_unique(column: str) → Expr[source]#; polars.n_unique(column: Series) → int. Count unique values. Examples. >>> df = pl.

Get the number of unique values in a list. Source code. Description. Get the number of unique values in a list. Usage. <Expr>$list$n_unique(). Value. Expr ...

Counts unique values. ... The polars n-unique command resides in the polars plugin. To use this command, you must install and register nu_plugin_polars . See the ...