Struct polars::prelude::ListNameSpace

pub struct ListNameSpace(pub Expr);

Available on crate feature lazy only.

Specialized expressions for Series of DataType::List.

Tuple Fields

0: Expr

Implementations

impl ListNameSpace

pub fn len(self) -> Expr

Return the number of elements in each list.

Null values are treated like regular elements in this context.

pub fn max(self) -> Expr

Compute the maximum of the items in every sublist.

pub fn min(self) -> Expr

Compute the minimum of the items in every sublist.

pub fn sum(self) -> Expr

Compute the sum the items in every sublist.

pub fn mean(self) -> Expr

Compute the mean of every sublist and return a Series of dtype Float64

pub fn sort(self, options: SortOptions) -> Expr

Sort every sublist.

pub fn reverse(self) -> Expr

Reverse every sublist

pub fn unique(self) -> Expr

Keep only the unique values in every sublist.

pub fn unique_stable(self) -> Expr

Keep only the unique values in every sublist.

pub fn get(self, index: Expr) -> Expr

Get items in every sublist by index.

pub fn first(self) -> Expr

Get first item of every sublist.

pub fn last(self) -> Expr

Get last item of every sublist.

pub fn join(self, separator: Expr) -> Expr

Join all string items in a sublist and place a separator between them.

Error

This errors if inner type of list != DataType::Utf8.

pub fn arg_min(self) -> Expr

Return the index of the minimal value of every sublist

pub fn arg_max(self) -> Expr

Return the index of the maximum value of every sublist

pub fn diff(self, n: i64, null_behavior: NullBehavior) -> Expr

Available on crate feature diff only.

Diff every sublist.

pub fn shift(self, periods: Expr) -> Expr

Shift every sublist.

pub fn slice(self, offset: Expr, length: Expr) -> Expr

Slice every sublist.

pub fn head(self, n: Expr) -> Expr

Get the head of every sublist

pub fn tail(self, n: Expr) -> Expr

Get the tail of every sublist

pub fn to_array(self, width: usize) -> Expr

Available on crate feature dtype-array only.

Convert a List column into an Array column with the same inner data type.

pub fn contains<E>(self, other: E) -> Exprwhere E: Into<Expr>,

Available on crate feature is_in only.

Check if the list array contain an element

Trait Implementations

impl IntoListNameSpace for ListNameSpace

fn into_list_name_space(self) -> ListNameSpace

impl ListNameSpaceExtension for ListNameSpace

fn eval(self, expr: Expr, parallel: bool) -> Expr

Run any Expr on these lists elements