13 февр. 2022 г. · All polars expressions within a context are executed in parallel. So they cannot refer to a column that does not yet exist. A context is:.

16 авг. 2024 г. · When I'm aggregating data in polars (e.g. groupby , rolling , group_by_dynamic and calling .agg(...) ) how can I get a specific nth position? ( ...

14 февр. 2023 г. · I want to select columns in a Polars DataFrame based on a condition. In my case, I want to select all string columns that have less than 100 unique values.

22 мая 2023 г. · If you're using the column names, you can: select the first 2 columns by name; create a list from all columns excluding the 2 named columns ...

28 мая 2024 г. · How do you evaluate an expression in Rust polars without destroying the dataframe? For example, I have an expression, ...

16 окт. 2023 г. · Select columns 'A', 'B' form `frame` and return only those rows for which col. 'C' is greater than 7. return frame.filter(pl.col("C") > 7.0).select("A", "B")

15 сент. 2024 г. · You can use the polars.selectors.expand_selector function which lets you evaluate selected columns using either selectors or simple expressions.

4 сент. 2024 г. · A way to apply a Polars expression to a series directly, without using an intermediate like an anonymous function.

12 июл. 2023 г. · When writing select or with_columns statements in Polars I often wish to declare intermediate variables to make the code more readable.

30 апр. 2024 г. · I have a Polars dataframe where I'd like to derive a new column using a when/then expression. The values of the new column should be taken from a different ...