Spark By Examples

https://sparkbyexamples.com/polars/polars-series-count-function-with-examples/

Polars Series count() Function with Examples In Polars, the series.count() function is used to count the number of non-null (non-missing) values present in that Series. It excludes null (missing)

https://sparkbyexamples.com/polars/polars-series-std-explained-by-examples/

Polars Series std() – Explained by Examples In polars, the Series.std() method is used to compute the sample standard deviation of the values in a Series. It measures the extent to which data points