Path: blob/main/py-polars/docs/source/reference/expressions/functions.rst
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========= Functions ========= These functions are available from the Polars module root and can be used as expressions, and sometimes also in eager contexts. ---- **Available in module namespace:** .. currentmodule:: polars .. autosummary:: :toctree: api/ all all_horizontal any any_horizontal approx_n_unique arange arctan2 arctan2d arg_sort_by arg_where business_day_count coalesce concat_arr concat_list concat_str corr count cov cum_count cum_fold cum_reduce cum_sum cum_sum_horizontal date date_range date_ranges datetime datetime_range datetime_ranges duration element exclude first fold format from_epoch groups head implode int_range int_ranges last len linear_space linear_spaces lit map_batches map_groups max max_horizontal mean mean_horizontal median min min_horizontal n_unique nth ones quantile reduce repeat rolling_corr rolling_cov row_index select sql sql_expr std struct sum sum_horizontal tail time time_range time_ranges var when zeros **Available in expression namespace:** .. autosummary:: :toctree: api/ Expr.all Expr.any Expr.approx_n_unique Expr.count Expr.first Expr.head Expr.implode Expr.map_batches Expr.map_elements Expr.max Expr.mean Expr.median Expr.min Expr.n_unique Expr.quantile Expr.std Expr.sum Expr.tail Expr.var